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.
The time it takes to get pregnant generally increases with age. For example, a woman aged between 30 and 35 has around a 15% chance of getting pregnant per cycle. It's not uncommon for couple in their 30s to try for nine cycles or more before they conceive.