I burn about 5 full cords a year. I'm 42 and I guess I'm "in between". I have 75 treed acres, and cut and split right where it falls, then haul it home to the pile. Up until last year, I split everything by hand. Last summer I built a splitter and in the spring this year, I did some of both. I find with the smaller stuff and the clear trunks, it's a lot faster and easier to roll the blocks upright, whack them once and toss them in the trailer. But with the big stuff, the twisted elm, and some of the crotches, I drag those over to the splitter and let it take care of them. Heck of a lot more lifting and bending, harder on the back overall, and not as pleasant, but it takes care of those stubborn ones.
I think I'll probably keep using that approach going forward - splitting the easy stuff by hand and using power for the tough stuff. Nicest thing about the hand splitting (besides the peace and exercise) is that I'm only ever moving small chunks around, instead of trying to man-handle large rounds.