Is it weird to be childlike at the age of 21?

losing the child inside is something that happens to everyone that is why when they see some grown up having fun by doing silly things like children ,there first reaction to that is"dont act so childish",,they dont think about it but actually it irritates them,,cos children are difficlt to control and also dey r sometimes jealous cos it reminds them of how fun it used to b as a child and now it is gone.i think thats it .According to me,,one should never lose that "child" thing ,,,it helps us to have fun ,,nd doing sillly things,goofing around is fun.so i think its ok,,it is weird to others offcorse,,but i think its not a bad thing.