I've owned a teenager. I say owned because I paid a lot for those fancy shoes, the clothes, TV, phone, etc. It's sort of a running joke between the young adult and I.
I've also taken in a couple of youngsters - 18 to 21 - who could no longer live in the (dysfunctional) family home or who might have otherwise been homeless. It is a crazy world. A divorced Mom decides to remarry, throws her child in the direction of Dad who decides to not acknowledge that he fathered a child.
What is a kid to do? That kid came to my house... and stayed for a few months or longer. They're such slackers
but they will take out the trash, shovel snow, and they are frighteningly good with computers and power tools.