I didn't say it was the norm, just that it was my norm and it is the norm for more than few others. I know/knew some relatively mature 20-year-olds, but I'd say the vast majority of 20-year-olds are just trying to figure it out and don't truly have the life perspective to put things into place.
And I doubt many 20-year-olds (even the "mature" ones) would stand much of a chance at all with millions of dollars at their disposal and people fawning all over them. It's not normal or easy to have the sort of life Britney does - and even if she wanted to leave it, I doubt she knows enough yet to know how to do that.
As for me, I'm delighted that I was a 20-year-old who tried anything and everything her heart desired. It has helped me become a satisfied 40-year-old who knows the meaning of what she's got and who no longer has the need to sniff around trying to fill herself with things that don't matter.
Yes, my empathy for the "Britneys" of this world comes from a place of experience. Long live wild women! - may we live to find daylight and keep growing towards the sun.
Your "empathy" should be for the children, not an immature, self centerd woman.
Once one chooses to become a parent, it's time to grow up and stop indulging oneself.