There's a long and storied tradition of turning up your nose and rolling your eyes at people whose characters 'aren't realistic', which more or less means the character probably hit your professional/hobby/etc buttons where you're certain you Know Better.
"You can't have a PHD at 19, that's stupid."
"Martial artist-stripper-extreme sports-lawyer? No, you suck."
Both of those describe actual people, and I'll dig them up later. For now I'll open with:
John Urschel - Bachelors and Masters in Mathematics, 4.0 GPA, offensive guard for the Baltimore Ravens.
Too Young For Doctorate - Here's 10. Take your pick., from Karl Witte at 13 to Akshay Venkatesh at 20.
Still trying to re-find the super hot ex-exotic dancer turned lawyer who took a year off as a partner at her firm to do a year of extreme sports bullshit.