It is almost accepted truth that it is more likely that older mothers will produce a child with Down's, but children with Down's are by no means limited only to older mothers. Women in their twenties can also have babies with the condition, though the rate is lower.
高齡產婦易生唐氏症兒幾乎已成定論，但生唐氏症兒並非高齡產婦的專利，廿幾歲的產婦也可能生下唐氏症兒，只是機率較小。