On the other hand, I know plenty of guys I came through training with who were 19 or 20 and the passengers looked at them with surprise, and hesitation, that they were even old enough to be PIC. Pissed them off royally! Not that I blame them. One may be say 21 but have the face of a 15 year old, not that there's anything wrong with that, but passengers are gonna look twice. Heck, you'll love looking years younger when you get older. LOL!
Not saying this is right either. Just a fact. Your screwed either way. LOL! You either look too young or too old. Maybe its the 30 year olds that find peace and solice. LOL! JK!
Im a 40 year old Corporate FO. I started my career a little later as well. I also instruct. I get more feedback that people feel more comfortable training with me because Im older and therefor probably have more experience. Ive never gotten a look flying Coporate or Charter with my 3 stripes on that suggested no one trusted me because Im 39 or 40 and a health hazard. LOL!