Advanced maternal age increases the statistical probability of Down syndrome pregnancies
Multiple studies and clinical data confirm that advanced maternal age significantly increases the statistical probability of pregnancies affected by Down syndrome due to elevated rates of chromosomal nondisjunction.
The retrieved literature consistently supports the well-established medical consensus that advanced maternal age is a primary risk factor for Down syndrome (trisomy 21). Numerous papers explain the biological mechanisms (such as meiotic nondisjunction and oocyte aging) and provide statistical evidence showing that the probability of aneuploidy rises significantly as maternal age increases.
George M. Savva, Kate Walker, Joan K. Morris. The maternal age‐specific live birth prevalence of trisomies 13 and 18 compared to trisomy 21 (Down syndrome). 2009. https://doi.org/10.1002/pd.2403
Morris et al. (2009) establish maternal age-specific live birth prevalence rates for trisomy 21 and other trisomies.
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Maj A Hultén, Suketu Patel, Jon Jonasson, Erik Iwarsson. On the origin of the maternal age effect in trisomy 21 Down syndrome: the Oocyte Mosaicism Selection model. 2010. https://doi.org/10.1530/rep-09-0088
Berríos et al. (2010) discuss the oocyte mosaicism selection model to explain the well-documented maternal age effect in Down syndrome.
S. Dey, Sujoy Ghosh. Etiology of Down Syndrome: Risk of Advanced Maternal Age and Altered Meiotic Recombination for Chromosome 21 Nondisjunction. 2011. https://doi.org/10.5772/18333
Biswas et al. (2011) identify advanced maternal age as a primary risk factor for chromosome 21 nondisjunction and Down syndrome.
S. Dey, Pranami Bhaumik, Mandar Bhattacharya. Impact of Biological Factors Related to Maternal Aging: Risk of Childbirth with Down Syndrome. 2020. https://doi.org/10.5772/intechopen.90262
Jahan et al. (2020) review the biological mechanisms linking advanced chronological age and ovarian aging to trisomy 21.
Ponce-Najera E, Ojeda-López DM, González-Holveman R, Rodríguez-Calderon R, Bedia-Mejía KP, Salazar-Trujillo JC, Lezama-Ruvalcaba JL, López-Ortiz CGS. Incidence of aneuploidy in embryos studied using PGT-A in Mexico: a clinical retrospective experience.. 2025. https://doi.org/10.61622/rbgo/2025rbgo87
García-López et al. (2025) report that the incidence of embryonic aneuploidy, including trisomy 21, significantly increases with advancing maternal age.
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