We have three boys. F5 Diablo was neutered at 3 1/2 months, F3 Jarvis was neutered at 6 months, and F4 Mickey was neutered at 12 weeks.
All three of them have their claws. They all tolerate weekly manicures, two of the three will lay in my lap and purr while I clip their nails, and the third, our F3 Jarvis who arrived unwilling to let us so much as touch his paws, now whines, and glares at me, but doesn't struggle. Jarvis will be 2 in February.
Jarvis was a scratcher as a kitten. He would use his claws in a way I thought was aggressive. I thought he was trying to get his way, it turned out he was scared. Once we removed fear from the equation, we removed all offensive use of claws. My 3 year old niece can drag him around by the head, and he doesn't like it, but he doesn't scratch her and he never has. I only get scratched when he is straight up terrified (ie I pick him up and the refrigerator delivery man drops- and I do mean drops the fridge). It has been a very long time since he has intentionally scratched anyone.
He does on the other hand scratch the couch. For a time Mike would reward him for scratching the couch by picking up a toy to "distract" him with play (in reality Jarvis trained Mike to play). We are still working on breaking that one, but now that Mike has come around to the idea that Jarvis was training him, and stopped allowing it to happen, it has improved.