Someone who is old enough and financially secure enough to do all the things they wanted to do as a child but were too young or poor to do them.

Someone who is of adult age that has childish behaviors and impulses and routinely acts on them with a slight amount of adult responsibility
Psuedo-Adult: "Ah, the pleasures of psuedo-adulthood. Just the other day I went by the store after work just to buy an ice cream sandwich, a Nerf gun, and a bottle of vodka to kick off the weekend!"
by Ishigoto June 10, 2013
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