Of course, it depends on what you see as canon, but the oldest he was (in what I think is canon) is 37. He could be married to someone else now and moved to the USA.
Possibly, if you go with one of the many different fanfic scenarios. Some of those do involve Harry going to the US.
One story I've been reading for the past several months (it's got over 100 chapters) has Harry married to Luna Lovegood and Ginny married to Draco. Hermione is having a love affair with the ghost of Severus Snape, who is roommates of a sort with Sirius Black in Purgatory. Snape and Sirius will be allowed to move on from Purgatory when they've accomplished their assignment, which is to give Hermione a sense of being truly happy with her life (she and Ron divorced).
Harry is a twit in this story, going so far as to drag Hermione to the wizarding world equivalent of a shrink, for insisting that Snape was visiting her regularly, he's been teaching her to cook (it's similar to brewing potions), and they fell in love. Meanwhile, Sirius has been stuck in Purgatory, reading Greek philosophy books pertaining to happiness and giving Snape pointers on dating. After 100+ chapters, Harry finally believes that Hermione hasn't gone crazy and that he's willing to believe her story that Snape visits her and only she (and Draco's children) can see him.
That's correct, the epilogue is stated to take place 19 years after the main events of Deathly Hallows, which would place it in 2017.
(Technically, the Cursed Child also takes place shortly after the epilogue but I refuse to acknowledge that pile of garbage as canon)
I found it rather ridiculous that Hermione and Ron would still be together after all that time. I don't like Ron, and the fanfic stories in which they either never married or they did marry and later divorced seem more realistic. Ron's got Quidditch on the brain, Hermione has zero interest in it, her thoughts are more nuanced, Ron's thoughts revolve around food, Quidditch, and women (when he's older)... I can't see them staying together for 19 years.
I'm reading a story now in which the Ministry of Magic has instituted a law that all unmarried witches and wizards from the ages of 17-35 must marry and produce children. Hermione is single in this story, and while I haven't finished reading it, it looks like she might end up with either Neville Longbottom or George Weasley (Harry and Ginny having already decided they'll marry).
first time I read that epilogue I hated it enough to not consider it canon at all, and the film confirmed that
The makeup and costuming department did a terrible job of convincing me that those three were 37 years old.
The argument over what "canon" means in SF/F franchises is ongoing. There's "canon" and "headcanon". The latter is why I feel free to ignore some of the Star Trek movies (and the last 3 series), and the whole Remus/Tonks storyline in HP.