Martin the Martian
I believe at the current rate of use the two Meteors will be flying into the 2040s.
Yes, because as old as the things are, there simply isn't an alternate type to replace it, the advantage the meatbox has over everything else is in the design layout, fast enough to test seats, a resilient structure and more importantly, a brace of wing mounted engines that are clear of the fuselage and hence unaffected by exhaust gas ingestion from the seat rocket motors.
Try and think of another similar type and you will struggle to find one.