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.
This is where a woman's ovaries stop producing an egg every four weeks. She no longer has monthly periods and is unlikely to get pregnant. In the UK, 51 is the average age for a woman to reach the menopause, although some women experience the menopause in their 30s or 40s. If you experience the menopause before the age of 40, it's known as a premature menopause. Menstruation (monthly periods) can sometimes stop suddenly when you reach the menopause. However, it's more likely that your periods will become less frequent, with longer intervals between each one, before they stop altogether.