Adult dog growls when I move in bed – should I change his sleep set up?

My dog Bones is about 5/6 he’s a really sweet boy! My bed is big and even if he’s on one side and I’m not the other he will grumble and growl when I move – I’m not sure if maybe he’s resource guarding the bed. He’s down this behavior basically his whole life and I don’t feel like it’s escalated but since he’s getting older I’m wondering if I should try having him sleep on his own bed or if anyone has experience with this behavior anything would help!