Pilot scheme in Merton Schools will see pupils taught how to boost fertility.
School girls are set to get warnings in class about the risks of having children too late amidst fears they could be able to conceive naturally.
The number of women giving birth in their late 30s or older has soared in recent years leading to a huge bill of taxpayer-funded IVF and other fertility treatment.
Now a pilot scheme will educate sixth form pupils in South London about the health benefits of having children when their bodies are in the optimum stage for childbirth.
However, critics have attacked the lessons for 'putting young women under even more pressure' by making them feel guilty about not becoming a mother as early as possible.
Around a dozen schools in the London borough of Merton will now include fertility tips in the relationship lessons attended by pupils aged between 16 and 18.