My toilet is probably 7-9 years old. And I've been noticing that it does not seem to have the flushing power it once had. And gets clogged easily. Is there anything I can do, short of buying a new one??
I have a septic, so harsh chemicals down the drain, isn't good
try cleaning the little jet holes under the rim out with a coat hanger wire. It makes more difference than you'd think, plus it doesn't cost anything (well maybe a coat hanger). Also make sure the hole at the bottom front is not clogged up. Between the jet holes and the hole at the bottom, that is where all the water from the tank comes out of. If either of these is clogged (or partially clogged), the water will flow slower and reduce the amount of force it comes out with.
Getting clogged might or might not have anything to do with the toilet. Theoretically, nothing should have happened to your toilet to change that. If it clogs, it's probably because something down your drain line is partially clogged. That could also affect the "flushing power". I'd address that first. As long as the tank fills up (look inside to check), and the water goes into the toilet when you flush, there's nothing much more the toilet itself can do.