Every day since I've started university in 2006 >_>
No worries about assignments getting handed in on time, no exams to prepare for, no student loans to apply for and repay. Just doing what you love for your whole entire life!
Though I think they would have to raise the age limit of becoming a trainer to something like 16, 17 or even 18. They would need some kind of education, meaning learning how to read and write. I can imagine all these illiterate Pokemon trainers walking around trying to figure out what everything means in their Pokedex. XD
Or at least they would need to learn certain basic life skills such as cooking, cleaning, washing etc.
Even then, they still need to learn the basics of caring for Pokemon. Look at Ash when he started, he didn't have a damn clue! Still doesn't some of the time XD