Check his military records. If you could find his parents on a census, that would give you a rough idea of their ages. Try to think where they lived and check out censuses for those areas first. For some areas there are even printed census indexes (which aren't 100% accurate - some people did get left out - but will give you a start). How about affiliations... was his dad a Mason or Knight of Columbus? Their ages should be on their death certificates. Keep trying, my friend, there are records out there somewhere. I have a few ancestors who I think must have sprung from the head of Zeus, full-grown, or maybe they were raised in an eagle's nest... or they carried brooms with them and covered their tracks. But keep on looking, and you will find something. And listen to thoughts that come to you late at night or in dreams. I've had some very interesting and profitable follow-ups from these.