In theory no problems with fertility (goats don't have a menopause), but they are unlikely to be able to give birth easily - their pelvis is probably quite stiff by now. I would also hazard a guess that they are quite fat, so would run into problems like pregnancy toxaemia etc. They would probably make a reasonable meat carcass, if you are able to trim off the fat...
I would stay away, and get some youngstock to put into kid this autumn if you want to breed goats.