If you were talking to a button-holding CM and you said "this is great, it's my first time as an adult, and I don't even remember my very first trip", if they are paying any attention at all, they will then hand you a button.
We were once given a button when the CM asked us if it was our first time, and we said "no, but it's our first day of this trip".
They hand them out like candy. They don't care if there's a back story. Is it your first time in memory? Does it feel like your first trip? Then do it.