Earlier quoted context omitted.
I'm kinda confused. It looked like you are also confirming PG's observation but you ended with a skeptical tone. Anyway this was interesting to me because most people tend to overly support youngster's into entrepreneurship but this looked more realistic and practical.
Agreeing with the principle and disagreeing with the number, I think.
The thing is that the age he gives (23) is so low that it's at odds with the principle, the same way as if I said "kids should wait till they're a bit older to drink alcohol, like after 8 years old" and someone disagreed and said 18 years old is a better age, they wouldn't just be agreeing with the principle and disagreeing with the number.