I would also like to add, that being the family historian, I have done tons of research on the census'. If you take a look, you will realize that a good majority of families were big (6 or more kids) and the age span is incredible.
Most births appear to have been about 2.5 years apart.... but as the woman (wife) got older, you could see where the children were more spaced out - 3 -4 years apart.
I think the oldest I have ever seen (so far in my family) was the wife about 48 or 49 giving birth. Pretty cool.
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