A lot depends on the breed too, Paula, but around 12 to 18 months, a moggy will be fully grown. Some breeds dont mature until they're 4-ish, and can continue physical growth up to that point too.
Moray has large and very powerful paws, but is a small cat. When we first got him, we thought his paws were an indicator that, like dogs, he'd grow to be a massive cat. But he's only little, with big paws, atjust past two years of age.
Wonder if Bob will be the same?