Regarding this old aircraft argument...
It is nonsense. Age is irrelevant. Its how the airline maintains the aircraft. And the vast majority of parts will have been changed since its original fit.
A bit like Trigger's broom - 20 new handles and brushes!
Heck, cargo airlines still use ancient B727s! Just looking on Airfleets for an example. Fedex have an MSN 162 A310-200. And they operate absolutely fine. Even Delta Connection use 38 year old B737-200!
There was some comment about the age of Monarch aircraft previously. As I said on the thread, Monarch has some of the best facilities in Europe and maintains to world class standards.