The Bone You Build by 30 Has to Last a Lifetime

In brief

Peak bone mass is set young, then falls fastest at menopause. Resistance exercise, calcium, and vitamin D protect it.

Bone density behaves like a savings account. You build the balance mostly through childhood and your twenties, reaching peak bone mass around 30, and then you draw on it for the rest of your life. The higher that peak, the more cushion you have later, which is why a young woman's habits quietly set a ceiling she will not feel for decades.

For women the drawdown steepens sharply at menopause. Falling oestrogen accelerates bone loss most in the first few years after the last period, and the process is silent: osteoporosis rarely announces itself until a wrist, spine, or hip fractures from a minor knock. This is a leading cause of lost independence in older women.

The levers are within reach at any age. Weight-bearing and resistance exercise signal bone to stay dense, adequate calcium and vitamin D supply the raw materials, and avoiding chronic under-eating, smoking, and heavy alcohol prevents needless loss. Under-fuelling that stops periods is particularly damaging to young bone.

A DEXA scan gives a baseline, and it is worth discussing around menopause or earlier if you have risk factors such as a family history, a past low-impact fracture, or years of missed periods. The best time to protect bone was your twenties; the second best time is now.

Key Takeaways

• •Peak bone mass is largely set by 30; young habits set the ceiling.
• •Bone loss accelerates in the first years after menopause and is silent until a fracture.
• •Resistance exercise, calcium, and vitamin D protect it; consider a baseline DEXA.