Mostly older ones. Still have a few from when I was born (so they're three-and-a-half decades old). The sad thing about the older ornaments is that they fall apart or break through simple wear and tear, and you just can't bring yourself to replace them because of sentimental value.
I do get one or two new ones every other year, either by something calling out to me or given as a gift. I'm tempted to get an ornament display tree because my own collection has more ornaments than a three foot tree (my own, not family's) can hold.