realistically should vtubers graduate from all activities within 10 years.
a lot can happen in 10 years not to mention you will make the jump to 30 in that timeframe. a 30 year old woman is different from the blue-eyed twenty something girl that started out not to mention you cant possibly keep up the charade of pretending to be teenage character. If you have a role in a movie or anime, sure but on stream more and more your experience of this world will show. Even Kizuna Ai is graduating soon.