19 years, 5 months, 21 days, 16 hours, and 23 minutes.

If the material world survived, living in a large city, I could probably scavenge for non-perishable foods for quite some time.

If it’s a nuclear wasteland and I’m fending off mutants, I guess it depends on how many caps and nuka-cola I can find.

Congrats! You’re human.

In addition to what others have posted, as long as you’re honest about it just being a hat and not making any special claims about it (like it was owned or worn by a famous person), I think you’re good.