I've always (and still do) had Siamese. A renter next door moved and just left her cats outside. This orange boy was crying and had a frost bitten nose. So, of course, we took him in. He was 6 months then and is now 2 1/2 yrs.
He has just started to show some aggression towards some of the other cats at feeding time when he knows he's going to be fed and I haven't gotten the canned food open. (We have 9, ages 18 on down) I make sure that he gets the food first, plenty of it (he weighs 17 lbs so he isn't starving!) and there is also dry food 24/7. He seems to be driving the others away, but he's fine as soon as he gets HIS food.