Enter your details below. We'll take you on a journey from head to toe โ showing exactly what your age and lifestyle have done to every part of you.
Biological sex
Your lifestyle — drag to personalise
🚬 Smoking
Non-smoker
1/day20/day40/day
🍺 Alcohol (units/week)
0 units/week
None14 (NHS limit)50 units
🏃 Exercise level
Light activity
NoneLightModerateActiveVery active
🥗 Diet quality
Average diet
JunkPoorAverageGoodExcellent
Educational purposes only · Not medical advice · Based on peer-reviewed population averages
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🧠
Section 01 — Starting at the top
Brain & Mind
Calculating…
—↓
Neurons lost since age 20
~85,000/day naturally
—↓
Neurons remaining (est.)
from ~100bn at birth
—↑
Neurons lost today
since midnight
—↓
Brain volume remaining
shrinks ~0.2%/yr after 40
—↓
Reaction time vs peak (age 24)
milliseconds slower
—
Memory performance score
100 = peak at age 25
—↑
Sleep cycles completed in life
each consolidates memory
—↓
Extra neurons lost to alcohol/yr
above natural baseline
⚡ Lifestyle Impact on Your Brain
—
✨ What If You Changed This?
👁
Section 02 — Eyes, ears & taste
Your Senses
Calculating…
—↓
Taste buds remaining (est.)
from ~10,000 in your 20s
—↓
Taste perception remaining
50% lost by age 60
—↓
Smell sensitivity remaining
~1% lost/yr after 30
—↓
Hearing threshold shift (high freq)
dB lost vs age 20
—↓
Cochlear hair cells remaining
15,500 at birth — irreplaceable
—↓
Night vision sensitivity remaining
rod cell efficiency vs age 20
—↑
Times you've blinked in life
~15,000/day
—
Colour discrimination score
100% = peak, declines after 50
⚡ Lifestyle Impact on Your Senses
—
✨ What If You Changed This?
🥼
Section 03 — Your outer layer
Skin, Hair & Teeth
Calculating…
—↑
Skin cells shed in lifetime
~35,000/hour
—↓
Collagen remaining
~1%/yr lost from age 25
—↓
Active hair follicles remaining
from ~100,000 on scalp
—↑
Hairs shed in lifetime
~100 strands/day avg
—↓
Estimated greying
50-50-50 rule (JAMA)
—
Estimated skin age
lifestyle-adjusted
—↑
Total fingernail growth in life
~3.5mm/month per nail
—↓
Tooth enamel remaining (est.)
cannot regenerate
⚡ Lifestyle Impact on Your Skin & Hair
—
✨ What If You Changed This?
❤️
Section 04 — Never stops
Heart & Circulation
Calculating…
—↑
Heartbeats since birth
~100,000/day, never resting
—
Estimated max heart rate
220 minus your age (bpm)
—↓
Cardiac output vs peak
~1% decline/yr after 30
—↑
Litres of blood pumped in life
~5L/min at rest
—
Estimated arterial age
lifestyle-adjusted
—
Cardiovascular risk estimate
rough guide — consult your GP
⚡ Lifestyle Impact on Your Heart
—
✨ What If You Changed This?
๐ฌ๏ธ
Section 05 — Every breath counts
Lungs & Breathing
Calculating…
—↑
Breaths taken since birth
~15 breaths/minute
—↑
Breaths taken today
since midnight
—↓
Lung capacity remaining
% of peak (peaks age 25–35)
—↓
Extra capacity lost to smoking
above natural decline
—
Estimated lung age
lifestyle-adjusted
—↑
Litres of O₂ absorbed in life
~0.25L absorbed per breath
⚡ Lifestyle Impact on Your Lungs
—
✨ What If You Changed This?
๐ท
Section 06 — Your silent workhorse
Liver & Detox
Calculating…
—↑
Alcohol units your liver processed
1 unit = 1hr processing
—
Liver regeneration capacity
unique — can regrow up to 75%
—↓
Fibrosis risk score
F0 = none → F4 = cirrhosis
—
Estimated liver age
lifestyle-adjusted
—↑
Liver cell generations in life
hepatocytes renew every ~300 days
—↓
Metabolic rate vs age 25
~2–3% slower per decade
⚡ Lifestyle Impact on Your Liver
—
✨ What If You Changed This?
๐ฅ
Section 07 — Your second brain
Gut & Metabolism
Calculating…
—↑
Meals eaten in your lifetime
~3 meals/day average
—↓
Gut microbiome diversity score
100 = optimal healthy adult
—↓
Metabolic rate decline from peak
vs your age-25 baseline
—
Type 2 diabetes risk estimate
lifestyle-adjusted · consult GP
—↑
Gut lining cell generations
full replacement every 2–4 days
—
Gut bacteria species (est.)
healthy adults: 500–1,000
⚡ Lifestyle Impact on Your Gut
—
✨ What If You Changed This?
💪
Section 08 — Your framework
Muscles & Bones
Calculating…
—↓
Muscle mass vs peak (age 30)
3–5% lost/decade after 30
—↓
Estimated strength vs peak
~15% loss by 50, ~30% by 70
—↓
Bone density vs peak
peaks at age 25–30
—↓
Height lost to disc compression
~1cm/decade after 40
—↑
Estimated steps taken in life
avg ~7,500/day
—
Recovery time multiplier
vs your speed of recovery at 20
⚡ Lifestyle Impact on Your Muscles & Bones
—
✨ What If You Changed This?
⚡
Section 09 — Your hormonal clock
Hormones & Reproductive Health
Calculating…
—↓
Testosterone vs your peak (age 20)
declines ~1–2%/yr after 30
—↓
Annual testosterone decline
nmol/L per year at your age
—↓
Sperm quality index
motility & morphology after 35
—
Free testosterone remaining
SHBG binding increases with age
—
Fertility status
relative to age-25 peak
—
Exercise testosterone benefit
resistance training impact
—↓
Egg reserve remaining (est.)
~300,000 at puberty → ~1,000 at menopause
—↓
Oestrogen level vs peak
declines sharply around menopause
—
Est. years to menopause
UK average age 51 (NHS)
—↑
Menstrual cycles to date (est.)
from puberty ~age 12
—↓
Post-menopause bone risk
oestrogen protects bone density
—
Fertility status
based on age (HFEA data)
⚡ Lifestyle Impact on Your Hormones
—
✨ What If You Changed This?
🦵
Section 10 — Your foundation
Legs, Joints & Feet
Calculating…
—↓
Knee cartilage remaining (est.)
wear accelerates after 40
—
Knee replacement risk
lifetime probability estimate
—↓
Lower limb circulation vs peak
arterial efficiency with age
—↑
Miles walked in your lifetime
avg ~100,000 in a lifetime
—
Osteoarthritis risk estimate
affects 1 in 6 UK adults
—↑
Total steps taken in lifetime
each loading your joints
⚡ Lifestyle Impact on Your Joints
—
✨ What If You Changed This?
Your BodyClock Summary
Your personalised body report at a glance
All figures are population-average estimates from peer-reviewed research (PubMed, Lancet, Nature, BMJ). For educational entertainment only — not medical advice. Individual variation is significant. Sources include: ONS, NHS England, WHO, BHF, British Liver Trust, Diabetes UK, Endocrine Society, IOF, HFEA, RNIB, RNID. Consult your GP for personal health guidance.