I lost one of my adopted/rescued ferrets back in december, lucky just a few months before the local pet shop had had another set of abandoned/drop-off ferrets come in and the owner immediately thought of me. I ended up with the approx. 1 y/o female to go with my first ferret who will be 3 in december and my first adopted man, age unknown. I was glad when FatMan died that we had the female around for Dax ... a couple months ago we introduced another female in ... she was born in January so she was still little. I kept her in the playpen and only put them together when I was around, just incase. Babies like to pick and play and even if they don't mean to be, some adult ferrets can be too rough. My baby is now almost the size of my adults and very well bonded to the other female, not so much to Dax cuz he likes to pick on her. Keep in mind like said before, just because the play date might not go well doesn't mean your man doesn't want company, just maybe not the babies!
If the babies don't go over well try to find and older (but still younger!!) ferret. Sometimes that will go over better, since they're over there highly highly rambunctious stage!
Hope all goes well!!