Doing a mix of healthy eating, exercise, better sleep, and stress relief for 8 weeks might actually turn back the clock on aging in middle-aged men — by about 3 years on a biological level.

Healthy men in their 50s and 70s might be able to slow their biological aging in just 8 weeks by making big lifestyle changes, like better diet and exercise — one study saw cells look about 2 years younger.

Taking vitamin D pills and doing light exercise at home three times a week for three years doesn't seem to slow down or speed up how fast your body ages at the molecular level, based on four different aging tests.

Cutting calories for two years doesn’t seem to change certain biological age clocks in healthy adults, even though other signs of aging improved.

Cutting calories doesn’t seem to slow aging in healthy-weight adults when measured with certain DNA tests, and the effect might depend on which test you use.