Hello, Glad your dad is okay. And I don't think its really a set age for onset of OCD. I'm younger than you turning 21 this September. But my anxiety started out as just regular anxiety about illnesses and such. Then I started being scared of germs and thats when the OCD kicked in. So I think that something must have triggered my anxiety to start manifesting as OCD as well. I would talk to a mental health professional about this though they will have a better more broader answer than my personal experience.