reference frames - Does a human cell age the same speed as a quartz clock?

When discussing how time slows down when you are going very fast, it's always explained with a clock, the clock slows down, cetera.

But is it possible that a human cell, or molecules in general don't necessarily work or slow down the same speed as a clock does?

Answer

It is difficult to think of any plausible, rational reason why say, your leg bones, would age at any different rate than a clock, if you could make one, composed of biological parts.

Time dilation effects everything exactly the same way, humans cells are not exempt, although I am not sure this has ever been tested, as it is impossible to measure cell aging in these conditions.

Clocks are made of atoms, (and molecules) and we know they undergo time dilation, humans are made of atoms, (and molecules), so it seems very , very likely that they undergo the same effect.

If you read about this experiment Time dilation , it will add more details to this brief answer.