Expatriate health insurance customers could be tempted to reconsider their family plans after research has highlighted the increasing difficulties in conceiving as women grow older.
A review published in the Obstetrician and Gynaecologist highlighted that the mean age of childbearing has risen substantially over the last 40 years.
In 1968, the average age was 23 but in 2008 this had increased to 29.3.
But the effects of waiting to have children are clear. At 25, just five per cent of women take longer than a year to conceive but by 35 this has risen to 30 per cent of women.
International health insurance customers can discuss their family planning needs with their healthcare providers.
David Utting, speciality registrar in Obstetrics and Gynaecology at Kingston Hospital NHS Trust and co-author of the review, commented: "Clear facts on fertility need to be made available to women of all ages to remind them that the most secure age for childbearing remains 20-35.
"However women and doctors should remain vigilant to prevent unplanned and unwanted pregnancies."