Launching its new campaign, Conceivable?, the FPA warned that age alone is not a barrier to birth.
"It's important that women realize it's entirely conceivable that just one night of unprotected sex in your late 30s, 40s, even 50s can end in an unplanned pregnancy."
Data for England and Wales shows abortion rates among women aged 40 to 44 are the same as for under-16s - four per each 1,000 women.
Other figures from the Office for National Statistics reveal women between 30 and 34 continue to have the highest fertility rate, at 113.1 per 1,000 women.
But the rate among women aged 40 and over has more than doubled since 1988, from 5.1 to 12.6 per 1,000 women, with more than 26,000 live births to women in this age group in 2008.
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