Fame has a way of sneaking up on you. Or, rather, of happening in relation to things you've long since stopped thinking about, and have to be reminded of in your day-to-day being in the world.
Such as in the phrase "hey, aren't you that guy/gal/pronoun that did that thing way back when?".
You probably are. And that thing way back when is what the questioner knows about you.
Fame. Sneaky bastard.