Constans was 12. Desi was 11. And yes. They just take them. I'm sure my father went to the chantry to let them know that we had budding mages on our hands but he never told me. Wise of him. I don't know if I would be able to forgive him for just giving them up like that.
Declan is about 8 now. And no, I have no wife and Mat's died a few years ago. Declan lives with his grandparents on his mother's side.
*shrugs* There's no rush. Especially if it's true that another Blight is coming. I wouldn't want to bring a newborn child into the middle of that.