Little kids laugh at nothing and it’s the best sound in the room. Don’t grow out of that completely.

Little kids laugh before anything is actually funny, and most adults wait to be given permission. Somewhere between those two settings you pick up the idea that amusement has to be earned, and the threshold keeps creeping up until whole days pass without anything clearing it. That is a loss rather than a sign of maturity. The capacity does not vanish, it just stops getting used.

Let something small get you this week without first checking whether it was cool. Laugh at the stupid thing in the group chat instead of sending the crying face. Easy to amuse is better company than hard to impress.