I have a 60+ female friend who spends all of her free time skiing. She's taken to heliskiing in Alaska, and she's heading to Chile to ski this summer. She skis like a demon and doesn't look bad in a tight sweater and ski pants, either.

At lunch, a girlfriend told her that she was "too old" to be doing things like that.

Nuts to that. Like the existentialists say, you are what you do. There are no guarantees about how long you'll live, but keep heliskiing and trying other new things, and you'll stay young right up until your last moments on Earth.