Longevity medicine: what it is and what has evidence (no promises)
What longevity medicine is, what really drives how many healthy years you get, which tests are worth doing and what is being sold without enough evidence.
4 min readEducational content by RejuvelookUpdated in October 2026
In short
Longevity medicine aims to add healthy years, not just years. What matters most is well studied: not smoking, staying active, keeping a healthy weight, eating well and controlling blood pressure, glucose and cholesterol. Biological age tests and many fashionable treatments are not yet validated well enough to base decisions on.
Key points
- Five low-risk habits were linked to about 14 more years of life expectancy at 50 in women and about 12 in men.
- Each extra unit of cardiorespiratory fitness is linked to 13% lower mortality.
- Blanket health checks have not reduced mortality in trials.
- There are still no ageing biomarkers validated for clinical use.
- Cardiovascular risk, which can be measured and changed, is the core with the strongest evidence.
Longevity medicine rests on a simple idea: the aim is not only to add years to life, but life to years. It is personalised prevention, focused on what most influences how long you stay healthy and independent. It also demands honesty about what the evidence supports and what it does not.
What it is, and what it is not
It is preventive medicine with data: measuring your risk, acting on what can be changed and checking whether it works. It is not the pursuit of a younger face or a menu of fashionable therapies, and it does not promise to stop ageing.
Aesthetic medicine and longevity medicine complement each other, but they answer different questions. Aesthetics deals with how you look. Longevity deals with how you age on the inside.
What matters most
What drives how many healthy years you get is well studied, and none of it is exotic. In two large US cohorts followed for more than 30 years, five low-risk habits made a big difference: not smoking, a healthy weight, at least 30 minutes of physical activity a day, moderate alcohol intake and a good-quality diet [1].
At 50, people who met all five could expect to live about 14 years longer if they were women and about 12 years longer if they were men, compared with those who met none [1]. It is an observational study, but the size of the effect and its consistency with other data are hard to ignore.
Fitness deserves its own mention. A meta-analysis of 33 studies found that each extra unit of aerobic capacity (one MET, roughly running 1 km/h faster) was linked to 13% lower mortality [2]. The WHO recommends 150 to 300 minutes of moderate activity a week, plus muscle-strengthening exercise at every age [6].
What to measure, and what not to
Measuring makes sense when the result changes a decision. The core with the strongest evidence is cardiovascular risk: blood pressure, lipids, glucose, smoking, weight and waist. European guidelines combine these in tools such as SCORE2, which estimate your ten-year risk and guide when and how to intervene [5].
More tests do not equal more health. A Cochrane review of 17 trials and over 250,000 people concluded that general health checks in unselected adults do not reduce overall, cardiovascular or cancer mortality [3]. The value lies in choosing what to measure according to your risk, and in what you do next.
We go into this in our guide to the longevity check-up.
What does not have evidence yet
Biological age tests, such as epigenetic clocks, are a promising area of research. But an international expert group noted in 2023 that standards and validation are still missing for clinical use [4]. Today they cannot tell you which treatment to choose or prove that one is working.
The same goes for many drips, supplements and therapies marketed as anti-ageing. Something that works in cells or animals has not thereby been shown to extend a person's healthy life.
What the evidence says
Each statement shows its level of evidence and the sources behind it.
Supported
With caveats
- Cardiorespiratory fitness predicts mortality and cardiovascular events, and it improves with training.[2]Moderate evidence
What it looks like in practice
A serious programme is a method, not a product. It usually follows four steps:
- History and goals. Your background, your family's, your habits and what you want to protect: staying active, looking after grandchildren, working without limits.
- Measuring what changes decisions. Blood pressure, targeted blood tests, weight, waist and body composition, using any previous results as a starting point.
- A few priorities. Two or three changes with measurable goals, because ten at once never last.
- Reviewing. Measuring again, checking whether the numbers move, and adjusting.
Artificial intelligence can help organise information, but it guides and does not diagnose. Decisions are made by a doctor.
What to expect, realistically
A good longevity programme will not give you a magic number. It will give you a clear reading of your risks, a few priorities and follow-up to check they are moving in the right direction. The changes with the highest return are usually the least glamorous: stopping smoking, getting fitter, keeping muscle, controlling weight and blood pressure.
Risks, and who it is not for
The main risk is excess: tests without a reason that throw up doubtful findings, anxiety and yet more tests, or expensive treatments without evidence. Nor does it replace care for a condition you already have, or the screening programmes offered by the public health system here or at home.
How it works at Rejuvelook
At Rejuvelook, the part of longevity medicine with the strongest evidence, cardiometabolic risk, is handled within our weight and metabolic health programme. It runs online anywhere in Spain and in person in Fuengirola, in English or Spanish.
It starts with a medical video consultation and, if indicated, blood tests at a lab near you. The doctor estimates your risk, agrees a few measurable priorities with you and follows you up regularly. If you would rather start with habits, our guide to healthy ageing sums up what is supported.
When to see a doctor
Book a medical consultation, or go to A&E if it is severe or sudden, if you notice:
- Chest pain, breathlessness or palpitations on exertion: see a doctor without delay, and call 112 if it happens at rest.
- Unexplained weight loss, tiredness that does not improve or a change in bowel habit.
- Relatives who had a heart attack, stroke or sudden death at a young age.
- If you are offered an expensive anti-ageing treatment with no explanation of the evidence behind it.
Frequently asked
Is it the same as a full medical check-up?
No. A check-up looks for disease that is already there; longevity medicine estimates your future risk and works on it with a plan and follow-up. Our guide to the longevity check-up explains the difference.
When does it make sense to start?
The sooner you know your risk factors, the more room you have to act. There is no need to wait for symptoms: cardiometabolic risk usually shows up in blood tests long before.
Do I need lots of tests?
No. Tests are chosen according to your history and risk. More tests do not mean more health: each one should answer a question and change a decision.
Does it replace my GP?
No. It works alongside your GP, in Spain or at home, and your specialists. Reports are available in English, so they can be shared easily.
Are IV vitamin drips worth it?
Unless there is a diagnosed deficiency that justifies one, there is no evidence that IV drips extend healthy life, and any intravenous line carries its own risks. They are not part of a well-judged longevity programme.
How does it relate to aesthetic medicine?
The two complement each other. Aesthetics deals with how you look; longevity with how you age on the inside. Many people start with one and find the other interests them too.
Do you use artificial intelligence?
It can help organise information and streamline follow-up, but it guides and never diagnoses. Clinical decisions are always made by a doctor.
Can I do this online?
The cardiometabolic part, yes: a video consultation anywhere in Spain, in English or Spanish, and blood tests at a lab near you. You can also be seen at the clinic in Fuengirola.
References
Sources checked against PubMed or Crossref. Cited as plain text, without links.
- 1.Li Y, Pan A, Wang DD, Liu X, Dhana K, Franco OH, et al. Impact of Healthy Lifestyle Factors on Life Expectancies in the US Population. Circulation. 2018;138(4):345-355. doi: 10.1161/CIRCULATIONAHA.117.032047. PMID: 29712712.Verified on 2 October 2026
- 2.Kodama S, Saito K, Tanaka S, Maki M, Yachi Y, Asumi M, et al. Cardiorespiratory fitness as a quantitative predictor of all-cause mortality and cardiovascular events in healthy men and women: a meta-analysis. JAMA. 2009;301(19):2024-35. doi: 10.1001/jama.2009.681. PMID: 19454641.Verified on 2 October 2026
- 3.Krogsbøll LT, Jørgensen KJ, Gøtzsche PC. General health checks in adults for reducing morbidity and mortality from disease. Cochrane Database Syst Rev. 2019;1(1):CD009009. doi: 10.1002/14651858.CD009009.pub3. PMID: 30699470.Verified on 2 October 2026
- 4.Moqri M, Herzog C, Poganik JR, Justice J, Belsky DW, Higgins-Chen A, et al. Biomarkers of aging for the identification and evaluation of longevity interventions. Cell. 2023;186(18):3758-3775. doi: 10.1016/j.cell.2023.08.003. PMID: 37657418.Verified on 2 October 2026
- 5.Visseren FLJ, Mach F, Smulders YM, Carballo D, Koskinas KC, Bäck M, et al. 2021 ESC Guidelines on cardiovascular disease prevention in clinical practice. Eur Heart J. 2021;42(34):3227-3337. doi: 10.1093/eurheartj/ehab484. PMID: 34458905.Verified on 2 October 2026
- 6.Bull FC, Al-Ansari SS, Biddle S, Borodulin K, Buman MP, Cardon G, et al. World Health Organization 2020 guidelines on physical activity and sedentary behaviour. Br J Sports Med. 2020;54(24):1451-1462. doi: 10.1136/bjsports-2020-102955. PMID: 33239350.Verified on 2 October 2026
Educational content. It does not replace a medical consultation or provide a diagnosis. Tests and treatments are indicated only after medical consultation and in line with regulation.