How lame is starting a band when someone is closer to 40 than 20?

Asking for a friend who strongly resembles how I look, think and act.

I had a band back in my 20s and had a good time. Never went anywhere with it, predictably, but it felt like all those years of practicing music finally amounted to something.

Going to concerts these days always gives me the urge to start back up again, but on top of all the impracticalities (friends having kids, jobs, and generally less time freedom predictably), it just seems overall to be not something to be proud of and brag about.

I think plenty of us have seen that meme "Telling someone you're in a band", and it has a picture of a girl at age 18 having a loving gaze with her hands over her heart; at age 24 with a look of disgust holding her hand out as if she's saying "No thanks"; at age 30 where she busting up laughing at the idea; and then finally a picture of a woman who is age 45 looking like a bad attempt at being an 80s hair metal groupie. Of course the woman at 45 is becoming hotter to me as I get older, but the joke is that it's generally not a cool thing to brag about.

But, man, I just want to play guitar in a band again, and I don't care about "making it" or the rock star party lifestyle. I'll probably do it regardless of how lame it is.

However I am genuinely curious: How lame is it for someone to start a band when they're pushing 40?