Help! My cat pees out of anger if our travel

Ok. I have a adorable 18 year old cat named kidogo. When ever I travel or leave home he gets mad and pees all over our house. I don't know what to do! I can't get rid of him because nowon will get him because he is to old!!!!! How can I stop him from peeing all over our house?

Have you taken him to a vet? You will want to rule out medical issues first.

Second, can you try containing him in a smaller room with a litter box when you go out?

He needs to go to the vet ASAP. With an 18 year old I'd be very worried about kidney or thyroid issues.