Cake cole fog

Aids question here my nephew who is 18...................? - how long can u live with aids

He says he is HIV-positive, which I destroyed, I do not know what to do and told me that some infected people to know that he did not accept the fact that he has been and continues to sleep without protection, how everything done what I tell how serious the situation is not that he did not hear, I fear for him and his comrades were just in the 12th Years and may not have said no. What should I do and how long u think it is to live? I've never known anyone with this disease and not know what to do