I am 14 and I have not got any issues about my mum having HIV. To me she is just my mum, there is nothing wrong or different with her.
To me, it feels like I have always known she has HIV. I am happy she told me about it when I was younger because I can just accept it. Sometimes I fear that she will die soon, but she says the truth is that everyone dies. With the right medication, it's likely my mum will live for as long as anyone else.