I guess its all a matter or personal opinions, but when I was growing up, there were laws that dictated the minimum age of employment, as I recall it I was unable to work until I turned 16. Today I actually think the age is lower than that, but it sure is not as low as eight.
I used the civil liberties example because some would like to think that is a defense for advertising online gambling. For me it’s about maturity, if the 16yr old is of legal age to work and has the gumption and smarts to pursue a job in internet marketing, more power to them.
Much difference in 16 and 20? Depends on the individuals. I know many intelligent 16yr olds that I would pit against any of the high school dropouts that currently work in our industry.