There really aren't any 'bar gigs' left much nowadays, at least in my area. Every bar is a restaurant. You do the early shift, you are playing to diners. You do the late shift, you are playing to diners AND drinkers. You do the late late shift... well, no-one's hiring a senior citizen with an arranger for those! Straight ahead rock bands for those...
I guess I'm kind of lucky. My area is mostly a yuppies and their families kind of spot. Not really a senior citizen community like further south in FL. So 'oldies', ballroom, Latin are right out. 70's and upwards, precious little 60's and earlier. Which, given my age, sits fine by me. And most of it sits pretty well with the kids, especially if you pick the better stuff from their era and play that too. Most of them are far happier listening to us play a Clapton tune than trying to do some Usher!
Plenty of alternative rock and pop nowadays that can be played by older musicians without seeming silly. John Mayer, Zack Brown Band, Drive By Truckers, things like that.
You just start to sound silly trying to do hiphop. Leave it to the DJ.
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An arranger is just a tool. What matters is what you build with it..!