Associated Press saying debris from the crash has been located. The crash site in the Alps was at an altitude of 2,000m (6,560ft).
This site has the oldest A320s in Lufthansa’s current fleet delivered in 1989, and the oldest 737s in their fleet delivered in 1991.
http://www.planespotters.net/Airline/Lufthansa
(They sell the older ones off, or get a few more years out of them on the “Germanwings” routes).