Not really. I don't think there's any age limit unless you impose that upon yourself.

My opinion is that if you are competent on your instrument and can sing well enough to not run the folks out of the room....and some awareness of one's actual, as opposed to imagined limitations would be in order here, then by all means seek out the proper places to gig.

Some of the best musicians are the seasoned citizens and there's no reason why they shouldn't be gigging if they wish.

The small compact PA systems and the technology afforded by laptops and software make this a totally reasonable decision. Back in the day as a young man, I dragged many a 150lb bass bin up a set of stairs and into and out of a club. I don't imagine at 50+ I would want to even consider such a thing but a small compact system with a 30lb sub.... certainly.

Choose the set list and find the club..... have 3 to 4 hours of good danceable music that fits the audience of the venue and go have a good time.

To me, playing for a live audience is something that is magical when it's in the groove.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.