hi BDTL,
No, i do not think it matters he is considerably younger.
what matters is that he has done the step- work and , as far as you can tell, is living his life with sobriety and integrity and " has what you want ". Not talking about material stuff here.
my sponsorperson was just 30 and i was 59 or 58 when i asked them, and iliked what i kept hearing when they shared at meetings and i could see how they "practice these principles" in their affairs.
as far as questions, ask what you wnt to know
and if you google something like 'aa sponsorship pamphlet' you will find an entire brochure with excellent info and questions to ask. well worth reading....and it might be available at your meeting, also. free.