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.
You could also find some of the lottery winners that absolutely hated what happened to their lives after they won and win the draw right before their ticket would have won.
That way you spare them the misery that the money brought them and you get a nice chunk of change for yourself in the process.