Play him but only 20-30 appearances until he is maybe 19 or 20.
two reasons.
1- it is ture he will possibly get burnt out by the time he is 23 or 24 and peak to early and it will be to the detriment of his ability
2- by the time he is 24 or 25 and you have played him regularly there is a good chance he will start to lose ambition at your club and request to move as he feels he needs a new challenge.this has happened a few times with regens with me even if my club are one of their favourites.i don't know if its just by chance or related but i think if he is 18 send him on loan for a season and usually abroad to like spain or somewhere , i have found that its really good doing this and when they come back the next season play them in a rotation role for that season then when he is 20 he can be a first team player.
Gradually introduce him to the first team, don't burn him out but tbh send him on loan .