1) you got serious in biking? Well, bike commuted to elementary school... but really learned the joys of cycling with my first "ten-speed" at about 19.
2) learned how to wheelie? Never really have... can't blow bubbles in gum either.
3) learned how to bunny hop? Probably about 15 years ago with my first fat wheel bike.
4) got clipless pedals/toe clips? Toe clips at 19, clipless in about 1990 at age 34. Little hazy on the exact date... remember that SPDs hadn't quite made the scene yet, so Look was all there was...
5) broke any bone(s)? Never.