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 do not have a period like people, but will bleed a little during a heat cycle. They usually go in heat between 6 months and 1 yr old for the first time. Technically they can get pregnant at this age, but it would be the same as a 10 yr old child getting pregnant.