Well, back in 2000 (when I was 48), I:
1) travelled by air for the first time;
2) visited Europe for the first time; and
3) cruised trans-Atlantic for the first time. (This was all within 3.5 weeks... Hmm, that was also the first time I'd been outside North America...)
This past week I had Vietnamese food for the first time (actually the second- but it was the first time I'd had these two particular dishes). And I had Sriracha sauce the first time (quite good, although it was tingly in my mouth). But I'm normally quite adventurous when it comes to food- so long as it doesn't have any animal parts or secretions, and won't probably make me physically ill, I'll try it... so I guess that wasn't much of an adventure by my standards.
I hope the concert was fun, Silva. I saw Paul McCartney back in 2011 (a big first) and hadn't found anyone who wanted to go with me. But the guy who wound up sitting next to me had gone alone too, and we had lots to talk about in-between sets.
I'm thinking it's hard to do a whole lot of major firsts in a short time. One every now and then, especially when we feel ourselves sliding into a rut, should be enough. (But I'd strive for at least one a year).