My 1st bike was a QA-50 Honda. That thing is much more scares of ME now! Poor thing! But as BKL points out start small and the go big. Europe has the right idea, you can't even drive a big bike (over 500CC) without 1 year of riding (and you didn't kill yourself).
Fun, you never said how old you "eldest" son was. Knowing you a little he could be ten years old!