Can you keep him in the living room or kitchen or another room and put a gate up so he can't leave that room?
Going from the bedroom to the garage is kind of a big difference, IMO.
He's a senior now, he might have the urge to pee more, even if it is just a dribble.
Sinister "The Prince of Darkness" 4 yr old black male GSD 3.11.09
Draco "Dakota's Unbreakable Vow" 5.5 mth old male Dalmatian 6.30.13
Cats: Chaos, Mayhem, Monster, Wicked