Originally Posted by sn939
Honestly, I don't think Doc's precise age was stated at any point in the game. According to the game, he was born in 1914, which would have made him 71 in 1985. He spent over 10 years trapped in 1885, so that made him around 81 chronologically. We don't know how long it has been for Doc in Episode 1 since he last met Marty...but I certainly don't think its been twenty years, or even ten (!)
Doc said "if I live to be 100, which I almost have" in It's About Time.
He also said Jules and Verne are going to college, which would mean that 19 years had passed since their conception. That would make Doc 90. Add in the amount of time it took Doc and Clara to be married, and the time it took to conceive a child, and the time definitely lines up with Doc's statement that he's almost 100.
Originally Posted by Tornreaper
So that explains why it still had flying parts or that it still had the ability to time travel before the crash? This is a huge hole in your logic.
The DeLorean had the ability to time travel before the crash because the time ripple didn't catch up to it yet since Doc didn't fade from existence until after they traveled through time.
As for the flying parts, they still exist in the timeline in 2015 (and as I mentioned before the future already exists as evidenced by Marty and Jennifer living in the future despite the fact that they hadn't lived it yet), since Doc Brown wasn't the one who invented them. Since they still exist, the time ripple took longer to catch up to it, as it had with Marty and the DeLorean itself.