Who says you have to be young to be a pop star? According to Giorgio Moroder, the godfather of disco, "74 is the new 24." Or so says a song on his new album, Deja Vu. But the proclamation may not be that far off. This hour, we talk to two other septuagenarian musicians in addition to Moroder who are still productively making music: the 74-year-old political folk singer Buffy Sainte-Marie, and the 78-year-old minimalist composer Philip Glass. It turns out that playing music late in life also has some neurological benefits. We also talk to Francine Toder, a psychologist who says that learning and playing music benefits the brain.