In my early teens I mulled over the observation that, as I grew older, my opinions, attitudes, and preferences were changing. I postulated a future self who held values different from mine, and tried to decide if this was a problem. (yes, I was THAT stubborn and strong-willed.)
I already accepted what might be thought of as the continuous loss of potential self due to imperfect memory and limited awareness. I was aware that what I percieved as my 'self' was already too 'large' to fit inside my consciousness, let alone my short-term memory.
A lot of things I won't try to explain here went into this:
I decided that whoever I was in the future, that was still me, and I knew that as that future self I would continue have good reasons for whatever I did.