Depends on your own looks level.
A chad should ideally never be blackpilled, they can also get sex and relationships and have constant validation. If they start to believe that it's not who they choose to be that's causing this, but something they were given, the validation could potentially be less satisfying. Although I would argue in most cases it's a non-factor.
A normie should atleast be able to live out his teenage years and early twenties being bluepilled. Normies can and will get low, sometimes mid-tier girlfriends. It's best that they enjoy that time before they get sucked into betabuxxing, raising the children of and getting divorce raped by a used up whore. Being blackpilled will prevent this for them, knowing the true nature of females.
An incel should be blackpilled at birth, it never began for them. It would potentially save them from a lifetime of rejection and mockery.