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In fact, besides the candidate of mother age (35) and others factors like smoking and maternal diabetes, the father candidate becomes one of the high risk pregnancy.
Research in Colombia University, New York, discovered that the risk of abortion 60 % higher experienced by a mother married more than 40 years old man, compared with 25-29 years old man.
The abortion occurred on the first three semesters, and mostly because of embryo has a genetic disorder. Besides that, man can produce sperm, how old they are!
However, the research show, the man fertility decreases because of getting older. Same like a woman, the older father will influence the condition.