No, the age has nothing to do with litter size… not in our breed, average size regardless of age is about 4-6 pups.. sometime more (up to 7 or sometime less... and again IMO, 2 is way to young for a Basenji.
And you really should do health testing first... you know of course that we have late onset health problems in Basenjis with Fanconi and PRA, that we have no DNA test for and need to have excellent records of the dogs in the pedigree to know if there are problems before breeding. While Fanconi is treatable, it is not pretty or easy to live and keep a Fanconi dog and PRA causes blindness, both are genetic. Hips has just start to become a problem so OFA is also very important along with Thyroid testing....
And then of course the is the reason you are breeding?... I think that any one that wants to be a Breeder has to honestly look at their dogs and ask themselves hard questions, what does my dog have to offer the breed? Is he/she conformationally correct proven in the show ring or on the performance field either doing lure coursing, obedience, rally or agility (obviously by showing your dog (any breeder) to its AKC conformation championship you have the opinion of your peers).. how is the temperament?.. how is the temperament of siblings, sire, dam, grand sire.. on and on.. as many years ago Basenjis did not have very nice temperments. Will you (any breeder) place pups on a contract and require spay/neuter? Will the contact state that you (any breeder) will be responsible for that pup for its entire live it he/she needs to be give up for any reason, at any age...? Breeding just for the sake of breeding is not really a good reason... IMO...