Depends what you consider "old", but the 757 is from the same era as the A320.

A380 was an example of "spending now in hope of future return". It was a case of long-term thinking gone wrong.

You cannot avoid mistakes every now and then. At least it had no particular safety issue and is quite a reliable aircraft, and they still made money with it. This is nothing like the issues Boeing is facing.

Sadly, in the end they lost money on it. They came to a point where producing the plane was profitable, but they never recouped the development cost: https://simpleflying.com/was-the-a380-programme-profitable/

A lot of A380 development went into A350 and new techniques going in other planes.

Including 787, actually.