He's around 12 or 13 years now. I have lost count.
In the first 8-9 years we owned him, we never had to worry about his claws. They grew but they seemed to wear themselves down naturally through his normal use. Now they are growing like wild, and growing thicker and curling more. Last weekend I looked at them and noticed that three of them had widened and curled so much that they were cutting into his pads. Oddly enough he didn't seem to care. He walked around without limping, and didn't even chew or lick at them.
Took him to the vet to get fixed up. The vet says that his age is causing the different nail growth and now I need to trim them ever 6 weeks to make sure they don't cut into his pads. Apparently he is too old to be sedated and unless it's something life threatening they won't do it. They used to sedate him when he was young to give him his shots and the various once a year things. So I'd imagine he was not too happy when they were cutting his claws out of the pads of his feet.
I also need to spoil him and feed him canned tuna to make him gain weight.
Everyone I talk to seems surprised that my cat is this old. But he seems pretty healthy. I imagine it's going to be tough when he goes/has to be put down. I've had him almost half my life.