Yes, the Canberra, first flight 1949, last served operationally with the RAF in 2006. That's fifty seven years.
Track back 57 years before 1949, and we are more than a decade before the Wright Brothers did their epic thing. From their efforts in 1903 it took a mere 43 years for the speed of sound to be broken in level flight. By the end of the 1950s both Concorde and the forerunner of the SR-71 were on the drawing board. No pre 1930s aircraft had any serious life beyond the early 1940s (unless you count the Tiger Moth - 1931 - which had '20s antecedents): the main pre-war candidate would be the DC-3, the origins of which were in the DC-1, also 1931.
In short, development in aviation seems to have gone exponential for half a century, then plateaued out dramatically.
Perhaps more to the point, (a) aerodynamics got as far as it needed to in 50-60 years, and (b) it turns out not to be terribly useful to fly at Mach 2. By contrast, avionics has been where the big advances have come from since the '50s, along with metallurgy; and probably still has a way to go.
So forty-year-old-plus platforms can remain fairly viable, with periodic avionics upgrades. Airframe metallurgy is the limiting factor. The B52 is likely to be the all-time champion. Wiki says it will soldier on into its 90s: I have heard it said they'll probably make their century. Never raced or rallied, as they say - just thundering on over the horizon, straight and level, not too much stress on the old wing spars.
What, then of the Tornado? I quite like the machine, having worked with the RAFG fleet while still a soldier: the Jaguar was a bit flighty, the Harrier a bit flaky, the Canberra a bit staid. (I never experienced the Buccaneer; and to my eye it was the F-4 that was the really handsome ship.) Its latest recce capability is very fine indeed, and Typhoon cannot (yet) compete.
Tornado wasn't quite destined to match Canberra for longevity. Well, it certainly has been raced and rallied! - and honourably so (from the Air Force perspective, that is; we'll ask Chilcot for the broader view): seen a heap more action than anyone on an early conversion course in, say, 1980 would ever have imagined. Prior to the recent announcement, the plan had been to operate the fleet - currently rather less than 100 strong - in fast-diminishing numbers, cannibalising as spares run out, until they were down to one smallish squadron at the end of this decade or more likely before.
To run operationally through 2017 actually requires three squadrons, which probably means (does Osborne but realise it) that new spare parts will need to be made. BAe can perhaps respond - on a cost-plus basis, naturally - or perhaps we buy from the Saudis? Gp Capt S.Weetabix of this parish will doubtless have a view. Soldier on!