you are grown up by 20 years,
20 years back no responsibility now lot of them
20 years back you head is with of hairs and now nothing ( this is for rizks)
20 year back u can run for longer time, now thinking even for walking with lazyness.
20 years back you can eat 10 pizzas now thinking for even one with worries of calories,
20 years back no fat in body and now bad cholesterol and other things.

many more like this.