@chaosmagic23 brought me a few days ago a sentence within my "The best thing I heard today..." campaign...
"You're never too old and it's never too late."
And according to one of my DJing video channels I watch, from a veeery experienced and seasoned teacher this is valid for DJing too. On a regular basis I see "older" DJs on YT too. And I assume there are other folks in your age - so your audience exists ;-)
If you like to do so, do so! Be glad to don't DJ for the young folks - because this is much harder... They know the artist DJ Hype and all this fancy Instagram stuff; which is great on Insta, but in 99,9% not the case for IRL DJing. At least not for 4, 6, 8 hour sessions...