He looks like a very cute mixed breed 🙂 . As for age, the only tip I’ve heard is that when rabbits age, their heels start to slide a bit farther apart due to arthritis. So an older bun’s back feet will be more parallel, and a young bun’s will have the heels turned in and toes more pointed out. Other than that is can be very hard to tell! A vet may be able to give a bit more of an estimate. Based on his proportions he looks very much adult, so probably older than 1.5.
His fur may get softer with good care, I know my buns did. <3
For bonding I recommend checking out the Bonding info section as a starting point: https://binkybunny.com/infocategory/bonding/
All buns should be spayed/neutered and given several weeks for their hormones to settle before you get started. It also really helps to do “pre-bonding”, where you set the buns up in side-by-side pens and swap who is in which pen every day or two for a few weeks. This gives them time to get used to each other’s scent and to learn the other rabbit isn’t totally a threat.
Are any of the rabbits currently bonded or will you be starting with 3 singles?
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.