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The age after which it is dangerous to have children has been named
American scientists have found that embryos that were obtained from the sperm of older men develop more slowly than embryos that appeared from the cells of young partners. This is reported by Daily Mail with reference to the report presented at the conference of the American Society of Reproductive Medicine.
Researchers from the Boston Science Center have determined that embryos obtained with the sperm of men over 50 years old develop 35% slower than embryos from people under 35 years old. The embryo obtained from older men reaches the blastocyst stage 4.3% later, after which the embryo attaches to the uterine wall. The authors came to similar conclusions after analyzing video recordings depicting the development of 3,532 embryos taken from 527 heterosexual couples.
Scientists from the Weill Cornell Medicine Medical Center have found that with age, male spermatozoa accumulate mutations, and also show a tendency to aneuploidy – an abnormal number of chromosomes in a cell. This increases the likelihood of conception of an unhealthy embryo. Doctors came to such conclusions after a study of seven age groups from 25 to 55 years. According to the researchers, both defects were most common in the surveyed men over 55 years old. In addition, the fertility rate decreased from 87.7% in the younger age group to 46% in the oldest group.
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