(Undated)  --  Two-time Olympic gold medalist Ashton Eaton is retiring from track and field at the age of 28.  Eaton won three NCAA decathlon titles while at Oregon before winning gold in the event at the Rio and Beijing Olympics.  Eaton's wife, former Duck Brianne Theisen-Eaton, is also retiring after winning bronze in the heptathlon in Rio for Canada.  She won three NCAA heptathlon titles at Oregon.