I mostly ran 172.5 cranks on my bicycles, but when I built my touring bicycle fifteen years ago I used 175 Shimano XT cranks because that’s what I could get. When riding on trails, the pedals sometimes touched bumps or rocks so a few years ago I switched to 165s. I like them very much.
I am through with my 60s and have shrunk from 6’ to 5’11”. I have long used the Greg LeMond saddle height formula which measures from the top of the seat to the bottom bracket center without regard to crank length so I haven’t changed saddle height.