This is really an NA matter and I don't know what the NA program says. But as an AA member I can say our book places to time limit on sobriety before you can sponsor. In fact, if they had adopted that practice AA would not exist today.
Imagine if Bill had said to Dr Bob, "sorry chum I can't sponsor you as I've only been sober six months" - ridiculous eh?
My suggestion : look in the mirror, ask yourself "do I have anything to offer this person?"
Right at the start of our Big Book, Ebby impresses upon Bill the need to work with others as Ebby had worked with him. It is core to long term recovery.
It is my observation that those who sit on there a#$ being sponsored but not doing sponsoring themselves for too long, miss the whole point. The most fantastic spirtually rewarding part of the program is helping another to recover, and watch that process occurr right in front of you. There ain't nothing to beat that!
It's why I keep coming back after all this time