
“Elder daughters may provide more help to their parents in raising their younger brothers than do elder brothers,” the Telegraph quoted study authors Fritha Milne and Debra Judge, of Western Australia University, as saying. “Associated with this prolonged help is a delay in sexual activity and thus a delay in potential for starting their own family.”
The researchers studied 273 people aged 18 to 75 and found girls with exclusively elder brothers were almost a year older when they had their first period than those with no older siblings or those with only elder sisters. And girls with only younger brothers were on average almost two years older when they first had sex than those with no younger siblings.Source
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