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24th November 2017
03:20pm GMT

"If you want to have a 90 per cent chance of having three children, you need to start trying to get pregnant when you are 27."
Prospective dads have a slightly bigger window of fertility, but Mary confirmed that age is also a factor for them.
"Once men go over the age of 40, it reduces their fertility by about 50 per cent."She said that while the statistics are stark, age is the main factor in fertility.
"Knowing your age is the most important thing. If you are 30, you need to start thinking about it very soon."Do you agree with this? Join the conversation on Twitter or in the Facebook comments.
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