I'm 35, but I grew up splitting wood. We used to burn it in an old coal stove, and we could go through a full cord in less than 3 weeks. Man, that thing ate a lot of wood!
Up until two years ago I used an 8lb maul and a splitting wedge as needed. Then I thinned out my forest and wound up with pieces up to 4' in diameter, and full of knots. After spending 45 minutes per round trying to split the stuff, I went out and bought a 27 ton splitter, tow behind style. It can do horizontal or vertical (which is how I use it for the big stuff).
For the really small stuff (less than 10" in diameter) I sometimes break out the maul and wedge, but I generally have some big stuff as well, so I'll split the small stuff by hand until I get tired, then switch over to using the hydraulic splitter.
Cut, split, stacked a cord last weekend. Took maybe 4-5 hours.
I've put away about 22 cords in the last two years. I was burning about 4 cords a year, but I got a new Quadrafire stove this spring, so I expect that number to go down. Wood is my only source of heat...