let the guys and girls with mortgages and young kids have their turn
Career progression is not about letting someone 'have thier turn'.
I'm at best halfway through my career and wouldnt expect anyone at the top to step down out of kindness.
If anyone 'wants thier turn' there are (where) plenty of opportunities overseas. If you want to float in the slow moving pool of progression in Australia then live with the consequences, or dont have kids/mortgage. I have, and it's fine by me.