Found in the spellings of Atkinson, Aitchison, Acheson, Aicheson, and Aitcheson, it is as a patronymic form of the medieval male given name Atkin or Adkin, itself a double diminutive of the Hebrew name 'Adam', meaning 'red earth'.
But for natural conception, age rarely keeps women from getting pregnant until they are over 40. Even in their early 40s, though, most women are still able to get pregnant, especially if they use ovulation prediction.
In women ages 30 to 35, there is a gradual decline in the ability to become pregnant. After age 40, there is a sharp decline in conception and a sharp increase in chromosomal abnormalities in eggs, making it very difficult for a woman to conceive and carry a healthy baby to term.