I think people of any age are qualified enough for sitting on babies.
Seeing how seriously you take the responsibility, taking classes for it and whatnot, I would honestly consider it. I think if it came down to it, then for the first time I'd only go out for a short while, or even stay in the house so I could see how well you can handle them. It also would depend on my children. If they were rambunctious (as most children are), I'm not sure if I would.