Question: What part of the body ages quickest and why?

Richard Unwin answered on 18 Nov 2015:

Hi horseyeventer.
That’s a great question, and I suppose it depends how you measure ageing. Some parts of our body, like our heart, are constantly regenerated by new cells replacing old ones – so the actual age of your heart is something like 9 years LESS than your real age! Some scientists have looked at features of our DNA to see which parts age the fastest and, in women, it’s the breasts, which have a DNA-age 12 years OLDER than the persons real age.
The parts which appear to age the quickest are the ones where we see signs of ageing first, and they’re the ones which we use the most but which don’t get renewed as much – the skin and the joints.