Ryan Seacrest can't hold back how worried he is about his father. During the Monday, July 21, episode of "On Air with Ryan Seacrest,", the show's host shared an emotional update on his dad, Gary Lee Seacrest, who was diagnosed with prostate cancer "years ago." "So my dad is about 80 years old and I have a very close relationship with my father. And my father was diagnosed with prostate cancer years ago and started his treatment. And he, it didn't get better. It got worse and it spread.