Assume that the future can change based on your actions, so any historical information that you bring along with you from the intervening 25 years may quickly drift out of the new realities history.
Edit: also assume that you can be given a healthy 21-year-old body if you want or take your previous self’s place.
Further, identification will be provided for you if you were not born at that time.
God forbid we end up on the 1985 timeline. Can you imagine if someone like Biff became rich and powerful?
The joke is that alternate-1985 Biff was literally based on Trump, specifically.