I'm glad you've decided to trim rather than cut it short. I cut my long hair very short and found it was WAY more work to keep it looking good than long hair. I had to get it cut much more frequently, use product etc etc whereas when it's long I just wash it, put in some no rinse conditioner and go, or blow dry if it's cold out. This only takes 10 mins even though my hair's long...plus I think long hair is very sensual and feminine, I love the feel of it on my back or the smell of it when freshly washed. Don't cut it.
As for older women, it's true that most in North America and Europe cut theirs but it's a shame. In India you see lots of silver and white haired old women with long, long braids and I think they look very dignified and beautiful, much nicer than the permed grandmas....