hell, I know a 90 year old who still skis. Snowboarding's a relatively new sport so you don't see a whole lot of older people on snowboards, but you do see them.
Another Japanese exchange student went missing on Whistler a couple of years ago. She ended up going off piste and got lost. She was found in the valley in the creek
One thing an instructor once told me was if you ever find yourself off-course, go UP a mountain, not down as most instinctively tend to do.