With the new A320/1neo's coming in, I can't help but wonder when the first classic A320 will be leaving?

The eldest is not too much different age wise from the recently departed A319's. And I'm assuming the cycles are around the same too, having been used on similar routes around Europe.

Of course, a few have gone to Gatwick already, but still, the first retirement must only be a couple of years away at most.