I’m 66, and have been married for 25 years. I got very lucky, and we have a very good marriage.
My health has certainly benefitted - there were several occasions where my wife persuaded me to get medical attention, when I was in the typical male mode of “it’s probably nothing, it will pass, I’ll walk it off etc.” In retrospect, I can’t imagine what I was thinking sometimes, like walking around with an abcessed tooth, thinking it’s just some minor passing gum/tooth sensitivity, until my wife insisted I get it checked out.
Another time, I had some bleeding “pimple” on my back, that I was ignoring until my wife insisted I go to a dermatologist - transpired it was a basal cell carcinoma, which was removed (15 years ago, and no recurrence, touch wood). Or my wife will spot that I’m dehydrated, because as she says, I don’t recognize my own body signals.
While we were dating, I loved my motorcycle, but she was against it. I insisted that I’m an excellent rider… except, the van driver was a terrible driver and I landed in the hospital and recovery for six months. I was eager to “get back on the horse”, but she would have none of it - and since then I can’t believe how stupid I was… because you can control your bike, but can’t control every driver on the road.
I can’t cook for the life of me, and my diet was terrible, eating out at all times. My wife is excellent with food prep, but more importantly, on the same page when it comes to consuming a great diet - we both got on CR and it’s been 25 years of top notch home cooking (restaurants are a rare outing).
I could go on. But honestly? We are just compatible and agree on the big things (even if we sometimes don’t on minor stuff), and are both easy going and low stress.
However, the biggest thing, and I know everyone will see this differently, but it’s been a blessing that we both agreed naturally - NO KIDS!!! Before the shouting starts - I’m not against kids, I don’t hate kids, in fact I like kids (in small doses, lol!). And I’m not saying kids are bad for you, and yes I know for most people their kids are the greatest blessing in life ever! I’m just saying for us no kids is better - kids are too much stress and worry (as my wife says, she’d be a basket case from sheer worry about bringing up a kid in today’s world). That right there, is a massive “keep us young” benefit… it may be that others are just more competent when it comes to raising kids, but we are not (then again, we see friends with kids, and if I’m honest I don’t see them have any “keep you young” benefit).
Bottom line, in this n1 case, marriage has been a huge boon to me in every way. YMMV.