Both of my boys like getting their bellies pet, but one will suddenly decide that he's done and he becomes a trap of claws and teeth. As long as you know his tell, you'll come out unscathed, lol
Well, it really depends on the personality of the individual cat. Some won't like belly rubs, some will. That being said, if a cat lets you touch it's belly, it means it really, really trusts you.
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I expect they'll grow out of it, though. Its unusual for them to keep asking for this kind of attention once they're a few years old.