When I first started pole dancing, one of my first instructors in Toronto was a grandmother!!! (And a hot grandma at that.) She knew how to dance sexy, wear tall heels, and could do lots of great spins and inversions and taught the first mostly boys class I've ever seen.
Also, at spinbuddies, where I teach now, we have an entire class of women between ages 40 and 55. Also we have a few mothers that take class with their daughters. Our oldest poler ever was in her early sixties (a beginner)!
One thing I have to say is that the whole time you older gals are feeling all self-concious around the younger trixters, I've got news for you: The young little trixters respect the hell out of you guys for being there!! You carry yourselves with a beautiful poise, grace, and inner self-assurance that none of those kiddies will have for another decade or two. Remember that we're all there to have fun and enjoy this amazing (and at times) crazy addiction to pole regardless of age, skill or gender.
At any age, exercise is always good and pole is always fun!