Over time, the chemical processes that allow our body to function, known as our "metabolic activity", lead to damage and a decline in the activity of our cells, tissues and organs.

Are biological age tests worth the hype? Direct-to-consumer biological age tests promise insights into how your body is aging, but experts say they should be taken with caution.

Direct-to-consumer biological age tests promise insights into how your body is aging, but experts say they should be taken with caution.

Are biological age tests worth the hype? Direct-to-consumer biological age tests promise insights into how your body is aging, but experts say they should be taken with caution.

Are biological age tests worth the hype? Direct-to-consumer biological age tests promise insights into how your body is aging, but experts say they should be taken with caution.