I would think that the technology for cryo freezing people would have been newish by 1999, so there probably aren’t too many people from before then who woke up in 3000. There may have been a few people who froze and unfroze around the same time, so he may not be THE oldest, but I think that he’s the oldest person in the series
John Adams was in the hall of presidents, and has Nixon beat by more than a few years.
https://www.oldest.org/people/founding-fathers-of-the-united-states/
Your list is oldest at time of death (IRL), not earliest born. Ben Franklin is the earliest born on that list, and also the earliest born head in a jar according to the Infosphere and Fandom wikis.