Trille born 2001?

Trille is in spite of his girls-name a neutered male. He came to our stable in September 2004, and at first he was rather shy - but he soon melted when I started feeding him. Then I also saw that he was earmarked and after some time I found his "owner". She wasn't really interested in him, so we agreed that he could stay with us if he wanted..., and he has not been away for one day since! He is, as the only one of our cats, allowed to go out, even though I don't like it - but he gets really depressed if I try to keep him inside...., so I must suffer..