The age thing is part of Wii Sports. It gives you 3 rounds of random sports to complete - then at the end, depending on how you did, it gives you an age!
I think its a pretty good idea - and if you are not a couch potato like dudley then you could move around and burn some calories! We all like to jump around/lark around when playing Wii Sports as a family
Looking forward to Wii Fit - thats going to be great for epileptics