At age what age can I tell my son that I am his biological father?

dude, i know these people are being ***** , but they're right. and if i where you, i would do what they say. if you keep your mouth shut, some one WILL find out, they WILL tell your brother, and it would just be worse. how long have you being keeping this? I know it might of being and accident, and that you saved their marriage, but you should still tell him. he has the right to know. Discuss with his wife on how, and when to tell him, plus who will tell him. who ever will tell him should tell him in a private spot in an appropriate time. not at the supermarket. THEY should discuss if they will tell the kid or not. it's not really your decision.