It's never easy estimating the ages of fathers, since men can become fathers at any age from mid-teens to 90s and up - and, particularly in earlier times, go through two, three or more wives before the last one buries *them*.
If you have a definite or probable date for the child(ren), though, you can make a rough guess at the age of the mother. Women become capable of childbearing in the early teens (or, rarely, a bit sooner) - and *stop* at approximately age 50 plus or minus about five years (early 40s to, rarely, late 50s). Prime years are about 18 to 35, and the first child generally makes its appearance within one to five years after marriage.
On average there may be one to three years between children - but the phenomenon of "Irish twins" (born a little over 9 months apart) was once fairly common and is still not unknown today.