A simple explanation would be that the you that was then, is not the you that is now.
Until someone comes up with a definative answer to question of nature V nurture, I'll go with my view that you are combination of your own, inate, inborn talents,moderated by your parents, further moderated by the kind of society you grew up in,then even further moderated by your own personal life experience.
I'm reasonably sure I flew a biplane in WW1 but think about the kind of world it was in 1917 as opposed to when I grew up from the 40s onward, in fact look at the differnce between when I was born (1948) to now.
Stuart
