I was hard core into PB for several years, but my work schedule changed and I can't make classes anymore. I do it online still, but nothing like at my peak of 5-6 classes a week. I loved it, although by the end of ~3 years I felt like I plateaued. When you go to a studio, they have different types of classes (Empower = more cardio, Define = weights, etc) so you can mix it up and not get bored if your schedule permits jumping around class times.
My ass has never looked so good, although I will say it only works in combination with diet. You will not see change with PB alone.
And FWIW my studio has loads of older ladies - like 60s+ - due to the area I live in (not DC) as well as all body types. Everyone just does what they can and it's a very chill environment.