I am interested what others think of my scenario. I have pretty much always recommended keeping ages very close, but for ME it hasn't worked well. I have fostered Dozens of rabbits -Most of the mature rabbits we get, we get in pairs (or else we get litters surrendered.) so we have LOTS of young buns needing homes. So My Magoo (4 yr old neutered male) doesn't take well to other rabbits, and definitely not males,. I have been doing preliminary dates with mature 3yr+ females to see who might be a possible candidate he might accept, but they are both "in their ways already", they are already street smart about the Dood! I haven't had much luck with the 3yr + rabbits and him. I did take a 4 yr old female recently that seemed he seemed to show promise getting along with. I took and had her Spayed, and she ended up having cancer that had already spread. She is in fine health now, but they didn't give her long. I actually am keeping her to provide a warm & loving home for the remainder of the short time she has left, but I am not going to proceed with bonding her of course. Another female I had that showed promise - again around 3 yrs old, died suddenly, no stasis, no odd behavior or observable issues.... I am beginning to think my Goo has a 6th sense. Anyhow, I would like to try a young rabbit (something I avoided for a long time...but I have seen more bonds working starting with young buns) but I think he would accept a younger rabbit easier and hopefully build a relationship living next to each other - without her being quite so territorial being younger, and hopefully she will familiarize with him & after she is fixed she may be more accepting? And statistics will be on my side for her health. I arleady provide homes for LOT of rabbits that needs socializing and have other issues - and they become great pets, but none that my Goo has accepted. I know rabbits can change once the hormones kick in, but I am hoping starting young with them next to Goo, they will both be more accepting.