I'm neurotic about working out b/c my dad always had me working out with him everyday since I was at least 7 - so it is just what I know to do. he has just recently put on some weight, but he could dunk until he was 40 or so. it was a sad day to see him when he realised he couldn't dunk anymore. you don't want to see your parents b/c real all of the sudden.
and my mom is just naturally tiny - although she also put some weight on after she turned 45.
must just be harder when you are older.