Markit wrote
".......Oh and also they end up hating each other too. Why? No experience of living together (both worked full time before) and after 30/40/+/- realize they can't stand each other 24/7 :) ....."
It doesn't matter where you live, the reality facing retirees is that suddenly, if the husband was the sole bread earner, he's now in the house all day and upsetting a routine that the woman has enjoyed for many years. That is why the shed has become such a popular recourse for many men... he is out of sight and out of mind. That way the frayed relationship might just hold on.
Live it seems is like the great expeditions during the period of historic exploration. (I love journals of exploration expeditions.) The parties start off with great jubilation and expectations. Not so very far down the track the expedition splits into factions which begin hating each other. Not to say that Pete and wife won't set off on their adventure and remain great friends. But, as Markit, suggests, there will be trials and icebergs along the journey.
Good luck. After all life is an adventure.