Replying to My dad still skiboards

Every time I go to the resort with my dad it is a little embarrassing because he still skiboards. He has been using the same pair of line jedis since 99 , I have been trying to get him to switch to skiing for years but he won't. I don't know what to do , I don't want to come right out and say dad you need to get with the times. worst of all he uses poles and only will wear jeans when skiboarding. Any ideas how I can make him stop skiboarding?