It wasn't really noticeable when I was 30 and he was 42.
But now I'm 38, I'm active and outgoing and he's 50 and falling asleep by 8pm every evening, makes zero effort with himself and doesn't ever plan to do anything, everything is "I'll do it tomorrow".
I hate this existence. I moved to the rural country a year ago for him because he said he'd be happier and have more energy. He doesn't.
:(