This is my cat (and my father's foot

) :
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Orph (Orphan), my cat, is about 15 years old. He's about average cat sized. He used to be fat, but then he got old.
He's not original to my home. Someone gave him up for adoption because he was eating them out of house and home.
My cat is VERY loud and VERY demanding. He only wants a few things -- in, out, and food. Attention is ok too, but he doesn't ask for it.
He has always been fed in the morning and in the evening. He always would ask for more food, but, we never gave in.
Lately though, he
MEOW!!!s at a level akin to screaming until we give in and feed him. We just give him more dry food (as, we know he'd eat two bites of a can of food, walk away, and waste it -- and cat food grosses my mom out -- we're not allowed to use spoons to spoon a bit of food out of the can, or put the can in the fridge to save some for later).
Any ideas what is wrong? He's always acted like he's starved. But, now he's AGGRESSIVE about it. And feeding him doesn't make him any happier. Two seconds later he's demanding food again.
He just seems like he wants to complain for the sake of complaining, or something. (Reminds me of my grandma). Is this part of old age?