jm,
you need to come up to boise and hang with my old boating friend. he's in his early 60's and activity of choice is slalom. last time I rode with him in his boomerang he still skis at 35-36. had a few birthdays to be touching shoulder when cutting but can still put out a pretty good tail.
taught both daughters to slalom and one is good. she can cut a pretty decent path in the low30's.