When you reach 25, it's finally time to fully grow up and be an adult.
You must, however, stop viewing carelessness, tardiness, helplessness, or any other quality better suited to a child as either charming or somehow beyond your control. A certain grace period for the development of basic consideration and self-sufficiency is assumed, but once you have turned 25, the grace period is over, and starring in a film in your head in which you walk the earth alone is no longer considered a valid lifestyle choice, but rather grounds for exclusion from social occasions.
The best advice: "Be interested so that you can be interesting."