I saw a quote in Google by Gertrude Stein – “We are always the same age inside.” I thought it was an interesting quote. Some people say they are “young at heart”, or some similar cliche, to indicate that they have some of the child left in them. Stein’s quote made me think that in the same vein, some people are “old at heart” Just like people who are young at heart have always been like that, “old at heart” people have probably been that way for most of their lives.
It’s probably possible to change the real age of your insides, but I’m sure it takes Herculean effort.