Thursday, November 08, 2007

Average paternal age keeps going up and up

As in previous years, the trend for men having children later in life is continuing. The following figures are based on live births per 1,000 men. The number of births in the 35-39 age group increased from 60.2 to 61.7. Also increasing, but less dramatically, was for the 40-44 age group, which rose from 23.4 to 23.9. Baio's age group, 45-49, also saw a slight increase.Looking at the larger trend, going back 20 years, in 1984 there were 46 in the 35-39 age group and only 17.8 in the 40-44 group. (all of this is in table 21 of the report)The CDC lumps everyone over 55 in one age group. That has remained steady for more than ten years, at 0.3 births per 1,000
. According to the Centers for Disease Control and Prevention, the number of babies born to parents older than age 35 more than doubled from 1970 to 1999, from 6 percent to 13 percent. This trend has led to the rise in the rates of infertility in the past decade, and to increased miscarriage rates and the possibility of a baby born with Down Syndrome (in addition to other genetic abnormalities).

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