My mom had two surprise pregnancies in her 40s. One because she left her IUD in 13 years. with the other she assumed she was safe due to age and scar tissue. She wasn't very sexually active, I don't think (very unhappy marriage). I don't think she went through menopause until mid fifties. All but one of us were unplanned, conceived from 16 to 42--all spread out.
My grandma had seven kids conceived from 17-38. The spacing grew in her 30s. Initially the kids were only 12-24 months apart. The last two were added after 5 year gaps. No idea what their sexual frequency was or if they tried to prevent.
Wife to Joe. Proud, tired mommy to Captain Destructive (6/09), Sir Screams-a-lot (8/10), and another little miracle due 3/13.
Trusting God brings life. Believing brings rest.