Daytime senior leagues can work really well if you have a high enough concentration of seniors in a given area. I spent several recent winters in the lower Rio Grande Valley in Texas, where there are a lot of active leagues - men's women's and coed. I played in three 8-ball leagues, one 9-ball league and two tournaments every week from December into March. Could have played in more if I didn't have other interests as well.
The age cutoff was 55, but most of the players were in their 60s and 70s with a few in their 80s. These were sponsored and hosted by the various RV/Retirement parks there. They all have pool halls with pretty decent equipment, no jukeboxes, no alcohol, no coin slots and no drama. Made for a very enjoyable time.