What this site is

HowOldIsMyBody.org provides educational information about how the human body changes with age — covering areas including cardiovascular health, hormonal changes, muscle and bone ageing, skin, brain function, and more. The site is intended to help readers understand the science of body ageing so they can make more informed decisions about their health.

All content is for informational and educational purposes only. Nothing on this site constitutes medical advice. See our Medical Disclaimer for full details.

Our editorial process

Every article on HowOldIsMyBody.org is produced through a structured editorial process:

  1. 01Source identification. We identify peer-reviewed studies, systematic reviews, and clinical guidelines relevant to the topic. We prioritise high-quality sources: randomised controlled trials, meta-analyses, and guidelines from bodies such as NICE, the NHS, and the British Medical Association.
  2. 02Data extraction and synthesis. Relevant data, statistics, and clinical thresholds are extracted directly from primary sources. Population averages, age-referenced ranges, and risk figures are taken from published studies — we do not extrapolate or estimate where primary data exists.
  3. 03Plain-language writing. Content is written to make complex clinical information accessible to a general audience, without oversimplifying the science or omitting important caveats.
  4. 04Accuracy review. Each article is reviewed against its cited sources before publication to ensure claims are correctly represented. Statistical figures are cross-referenced where possible.
  5. 05Ongoing updates. Health guidelines and population data are updated periodically. Pages are reviewed when new guidance is issued by NICE, the NHS, or major clinical bodies.

Sources we rely on

Content on HowOldIsMyBody.org draws on the following categories of source. Each article cites the specific studies and guidelines it uses.

NHS & NICE
Clinical guidelines from NHS England and the National Institute for Health and Care Excellence (NICE) are used as primary clinical references throughout.
PubMed / Medline
Peer-reviewed studies indexed on PubMed, including systematic reviews and randomised controlled trials from journals including The Lancet, BMJ, and NEJM.
WHO
World Health Organization population health data and clinical guidance, particularly for global health benchmarks and disease burden statistics.
ONS
Office for National Statistics data — used for UK population statistics, life expectancy data, and demographic health trends.
British Medical Journals
BMJ, British Heart Foundation, British Menopause Society, British Dietetic Association — specialist clinical bodies whose guidelines inform section-specific content.
Clinical Calculators
Calculator tools use validated clinical equations (e.g. Mifflin-St Jeor, Morris & Temple FEV1, QRISK-aligned factors) cited in their original peer-reviewed publications.

Corrections and accuracy

If you believe any information on this site is inaccurate or out of date, please contact us. We take accuracy seriously and review all flagged content promptly. Where a correction is made, the relevant page will be updated.

Important

HowOldIsMyBody.org is not a medical practice and does not employ clinicians in an editorial capacity. Content is research-based and written for educational purposes. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your GP, doctor, or relevant specialist with questions about your health. See our full Medical Disclaimer.

Privacy and data

Health calculators on this site process all data locally in your browser. No personal health information is transmitted to our servers or stored. See our Privacy Policy for full details.