Philosophers question the nature of identity. In law, the statute of limitations is in part an acknowledgment of this question. The 88 year old man is not the same person he was 74 years ago when he shoplifted a comic book. For some crimes, there are limits on how long after the crime the offender can be brought to justice. Philosophers focus on the difference in memories between the child and the adult, the teenager and the old man.
Economists grapple with the same issue, the question of identity, but call it time-inconsistency.
We focus on how tastes, desires, dreams, and preferences change over time. Before going to bed at night, I want to get up early and go to minyan. In the morning, when my wife gently calls me to get up, I don't want to leave the comfort of my bed. That's what alarm clocks are for. This type of strategic thinking and planning for the future contradicts our conception of an indivisible God.