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A new study suggests that the [numeral / number] of children a woman has might affect her rate [of / at] ageing and her lifespan. Research from the University of Helsinki in Finland found [what / that] women who had five children or [more / many] , or no children, aged faster than [those / them] who had a small number of kids. Researcher Mikaela Hukkanen said: "From an evolutionary biology [receptive / perspective] , organisms have limited [resources / resource] , such as time and energy. When a large amount of energy is invested [in / on] reproduction, it is taken away from bodily maintenance and repair mechanisms, which could [reduce / deduce] lifespan." She added that the finding of shorter lifespans of women who never gave birth was ["surprised" / "surprising"] .

The researchers used [historical / historically] data in their analysis of parenthood and [ageism / ageing] . They analysed the health data [in / on] 14,836 women. Researchers examined DNA data and blood [sample / samples] , then modelled the effects of reproduction on women's rates of ageing and longevity. Ms Hukkanen [postulating / postulated] that having a smaller number of pregnancies could have favourable [affects / effects] on a mother's health. One benefit is a possible [slower / lower] risk of breast and ovarian cancer. However, the "wear and [fear / tear] " and physical demands of multiple childbirths can [negate / negotiate] this lowered risk. Another factor that could increase longevity is the increased social support a mother receives from the [country / state] for having children.