“…We considered 35 years or older as the cutoff point for separation between young and older women. Most articles subdivided advanced maternal age into 35-39 years and ≥ 40 years 10,11,12,13,14,15,16,19,20,33,34,35 , others used ≥ 35 years 21,25,36,37,38,39,40 , and some only considered AMA age ≥ 40 years 41,42,43,44 . Regarding the definition of the age range for the comparison group, the studies were very different, with most using 20 to 34 years (30.4%), followed by < 35 years (21.1%), 25 to 29 years (17.4%), and others (26.1%).…”