I would say it's normal, but don't know that to be a fact. I see it as the same as humans in that as we get older we tend to slow down and need more sleep. There are exceptions of course and perhaps Joey is one of those.
My experience with Tethra also was that when we adopted the young lively Tui, he didn't sleep as much and I would guess Joey might run around a bit more if he had a much younger partner. It wasn't so good for Tui though as she had a slow, elderly bunny as a partner. I have been thinking of the ages of partner bunnies a lot recently and whilst I'm sure it doesn't make any difference to bonding, I think that the closer they are in liveliness is probably important for the bunnies quality of life. It's certainly something to ponder about I think.
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