Both Magic and Tricia should live normal lifespans with a nearly normal lifestyle. Most other HIV+ likewise should survive fine. Medical technology has advanced in the last decade.
But of course, as Smartt implies, nobody has lived for 20, 30 or 40 years under treatment. While the virus is greatly suppressed it is still present and gradually mutating at a much-reduced rate. At some point some virus may mutate into something the therapy used doesn't treat, and now you have to find a new therapy that treats both the mutated and original virus. At some point if there are too many different strains present there might not be any therapy that works against all strains.
Also, the drugs may not be easily tolerated by older people. In 30 years a therapy Magic can handle now might not be tolerated.
Note that Tricia got her infection from Marc Wallice but John Stagliano supposedly from a Brazilian tranny. These are probably different strains. John and Tricia need to be careful to not infect each other. HIV+ people in general need to avoid reinfection lest they take a simple-to-treat infection and turn it into one that is hard to treat, or cannot be treated at all.
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"If they can't picture me with a knife, forcing them to strip in an alley, I don't want any part of it. It's humiliating." - windsock