Interactive
Human Body Timeline
Scroll through the human body across a lifetime, from before birth to older age.
Human Body Timeline
Before birth
From a single fertilised cell, the body forms all its organs in about nine months — one of biology's most remarkable feats.
Infancy (0–2)
The brain grows rapidly and babies triple their birth weight in the first year. Bones are soft and many are still separate.
Childhood (2–12)
Steady growth, developing coordination, and the loss of baby teeth. Bones lengthen and the immune system meets many new germs.
Puberty (roughly 9–16)
Hormones drive a growth spurt and many body changes. Timing varies widely and normally between individuals.
Adulthood
The body reaches full size and peak strength. Bone density and muscle mass are usually highest in early adulthood.
Older age
Tissues change gradually: muscle and bone slowly decline, senses may dull, but healthy habits support wellbeing at every age.
This tool is for education and general interest only. It is not a medical device and must not be used to diagnose, treat or make health decisions. Always consult a qualified professional.
How to use it
- Step 1Pick a life stage.
- Step 2Read what happens to the body then.
- Step 3Follow the links to related guides.
A body across a lifetime
The human body is never static. It grows, matures and changes through clearly defined stages, each with its own biology.
Learn more
Read our guides to growth and development and the aging process, plus the article how humans grow.
Questions & Answers
Frequently asked questions
Height usually finishes in the late teens to early twenties, once the growth plates in bones close.
No. Aging is a natural biological process, not an illness, though it can raise the risk of some conditions.
No. The ages are approximate; individuals develop at different, normal rates.
Understand the science
Go beyond the numbers
Every tool pairs with a guide that explains the biology behind it in plain language.