The passage of time may be linear, but the course of human aging is not.

Rather than a gradual transition, your life staggers and lurches through the rapid growth of childhood and the plateau of early adulthood , to an acceleration in aging as the decades progress.

A study has identified a turning point at which that acceleration typically takes place: at around age 50.

After this time, the trajectory at which your tissues and organs age is steeper than the decades preceding, according to a study of proteins in human bodies across a wide range of adult ages – and your veins are among the fastest to decline.

"Based on aging-associated protein changes, we developed tissue-specific proteomic age clocks and characterized organ-level aging trajectories," writes a team led by scienti

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