How old are Donny Osmond's Sons?

Donny Osmond's sons are Donald Clark Osmond, Jr. (b. July 31, 1979), Jeremy James Osmond (b. June 8, 1981), Brandon Michael Osmond (b. January 29, 1985), Christopher Glen Osmond (b. December 12, 1990), and Joshua Davis Osmond (b. February 16, 1998). Meaning they are ages 30, 28, 25, 19, and 12 now (April 2010).