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.
Pingy putty? I’ve never heard of this before.
Also, nothing comes up when I search it on DuckDuckGo or start page
Putin and Xi Ping would still be serious threats to trying to take over the world even from 1999 perspective.