My personal experience is that if you have a great breeder, 10 months is the best age to bring a basenji home. I got Digital the brindlewonderkid at 10 months and he was housebroken, leash trained, show trained AND a perfect house dog. I could literally leave him in the house all day while I was at work UNcrated and NOTHING was disturbed.^ Yep, I have yet to have that repeated with any of my other dogs. Otherwise, I agree with what Pat has outlined especially if there is a good resident dog to show a younger puppy the ropes and socializations.
(^ He was left in the house uncrated shortly after I got him b/c he was bitten by something (spider??) and had to wear a cone for a few days.)