I had to look this up. Raye (8/27/1916-10/19/1994) is actually 11 months older than Diller (7/17/1917-8/20/2012).
According to their Wiki pages, Raye was performing on Broadway by the age of 18 and in a movie two years later. Diller didn’t appear in front of an audience until 1955, as @What_Exit noted.
You’d think I’d be used to it by now. And don’t get me started on the Banana Splits. They may not have played their own instruments, now that I look at it.