Can you get aids from someone who has never been sexually active? how many such people are out there anyway?

Get AIDS vertically: Yes. If a child is infected by its mother, it will carry the virus lifelong. The HIV virus has also been acquired by needle-sharing among parenteral drug users. These are only 2 of many possible ways a person could acquire the virus other than sexually. It's impossible to know how many people are infected, since the virus may cause few or no symptoms for several years, especially in adults.