77 here and mow a .75 acre yard with a cub cadet I bought in 09. still move snow with a snowblower. won't give it up until I have to. good exercise and I like doing the repairs myself. it is one of the things that keep me active. I also have a small garden which I like and it supplies fresh vegetable, but I am not very good at it. the way I see it is how much good it does for you and if you have the time.
Has your Cub Cadet been a good mower? My uncle and I went in halves and bought a Cub Cadet with, I believe, a 42" deck, back in late 2016. It replaced a tractor we had gotten from Sears in 2010, which was pretty much shot.
Our Cub Cadet was pretty good, up until last year. One of the pulleys pulled clean through the mower deck. Luckily, a local repair shop was able to weld it back together. The guy there was a bit shocked at how cheaply built they are these days...he said the mower deck wasn't much more than sheet metal. They also changed the oil, replaced the battery, replaced the blades, etc, for around $600 or so. That was the first serious money I think we've had to put into it, so not too bad, I guess. The guy at the shop said the starter was also getting a bit weak, and that was probably around a $200 repair. Although, when that time comes, I wonder if it's something I'd be able to do myself.
We also have an old 1969 Montgomery Ward tractor, that was built by Simplicity. Granddad bought it new. I brought it up with the guy at the repair shop, asking him if he could work on something like that, and, well, he politely declined. He also said, DON'T expect anything modern to last nearly as long as that old Simplicity, either.
In the interests of full disclosure though, I do remember Granddad rebuilt the engine in that Simplicity, at some point. And, starting around 1986, it also became more of a "backup tractor". Granddad bought a Hechinger tractor from the estate of one of Grandmom's friends after she died, and then bought a new 1990 Montgomery Ward, just before he died. The newer ones cut better, and could go faster, but weren't near as rugged/durable as that old Simplicity.