I always tell people when they say they're old (myself included) that you're only as old as you feel! According to one psychologist viewing yourself as younger than your age makes you think more toward the future which makes you make better health choices like engaging in exercise. Act young if you want to feel young. (Metro)
So what things do you still do that may be deemed immature ...
I still watch cartoons
Drink the little creamers from the containers at restaurants
Dance in front of the mirror
Love to sled and just lay in the snow
Tube down the river
Eat kids cereal... although I eat it for dessert now with all that sugar
What are some things you still engage in?