[Marilize]

I think asking for a back-up plan is a great idea, no matter what your age. I am 24 years old and I have a solid back-up plan for both my dogs. My parents would take them in a second, but my brother has a special bond with Cash, so Cash will go to him. June will probably join Cash or she will stay with my mom or sister. I've spoken to everyone involved and I'm even starting to save up in case something happens to pay for their food, vet and other costs.
Everyone needs a back-up plan and if I were a breeder, I'd definitely enquire about any potential owner's plans. As a breeder, you are responsible for that puppy's well-being for the rest of its life.