In my mind, if I had only known then what I know now. How many of us have told younger folks in our lives this? "It's not that bad. I've been there, done that and have a closet fully of tee shirts. Tell you what, this is what you do...."
That's why nearly all civilized societies venerate their elders as well springs of knowledge that keep us as a people from making the same goddamn mistakes twice.
Funny aside. Long ago, we told our brood in their very early teens there's nothing you can do that will shock us. We've either done it, know someone who did or have heard of it from reputable sources. We're black sheep children of the 60's and 70's, young adults in the 80's, so don't even try. It's useless and quite boring. Dad gave me the same words of wisdom..."I fought and killed Germans in Europe and all that entails. I doubt there's anything you can do that I'll find novel, so it's wasted effort to even try." I still lived my life and he would simply smile and say..."well, that was dumb and here's why." 
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