Most of the A319's are slated to move over to Rouge anyway.

as far as age it's optics/perception versus reality

In big picture it will be probably cheaper and beneficial to their image to get new aircraft instead of updating the older ones.

Seems every airline advertised how young their fleet is,the average person believe new is better/safer.

Me I'm more concerned how well maintained the fleet is, but at some point you can't replace every part that wears out