Egg abnormalities also usually involve larger chromosomal changes, and are therefore easier to test for.
Bella was born with Trisomy 18, a serious chromosomal condition that interferes with development.
Thanks to advances in chromosomal technology, science types are unlocking many of the mysteries of our genetic makeup.
Once an older woman does become pregnant, she runs a greater risk of miscarriage, foetal and chromosomal abnormalities, and pregnancy-related diseases.
They found that two chromosomal regions spanning a handful of genes seem to be important in controlling the activity of copia.
Bella, the youngest of Santorum's seven children, suffers from a rare chromosomal disorder called Trisomy 18, which causes severe medical and developmental problems.
Doctors have several tests available to see whether the child will have any kind of chromosomal problem that could come with aging eggs.
More common than these chromosomal variations are other variations in gender.
Her 18-year-old son Jermarl Henderson, who has a chromosomal disorder called DiGeorge Syndrome, has had multiple open-heart surgeries and requires intensive, complex therapy, she said.
Santorum canceled campaign events for Monday after daughter Isabella, who suffers from a chromosomal condition called Trisomy 18, was hospitalized for the second time this year.
At Styal prison, she will be able to live in the unit with her daughter, who was born on 3 November and who suffers from a chromosomal abnormality.
English Heritage said results of recent analysis of Peter's portrait by a professor of genetics, now suggested he had Pitt-Hopkins syndrome, a chromosomal disorder first identified in 1978.
Rick Santorum ended his presidential bid in the face of long odds, slowing fundraising and another bout of illness for his youngest child, who has a chromosomal disorder.
Bella suffers from a chromosomal condition called Trisomy 18.
The biological reasons for why this may be are unclear, but the researchers speculated that potential chromosomal abnormalities in the eggs of older women and mutations in the sperm of older men may be a factor.
Although the parents opted for termination on learning the news in most cases, if left to develop, these foetuses might have suffered from chromosomal conditions such as Down's syndrome and Turner's syndrome, which causes infertility in women.
Sitting in the hospital with his daughter, who was born with a potentially fatal chromosomal disorder, for the second time during this campaign put that in perspective for Santorum, especially since the delegate math was not on his side, the source said.
He also acknowledged the decision was not entirely political, saying the past weekend was a "time of prayer and thought" as he and his family cared for his daughter Isabella, the youngest of Santorum's seven children, who suffers from Trisomy 18, a chromosomal condition.
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