Too Old to Be a Mum?

Women old enough to be grandmothers are having babies. Fifty-nine-year-old Essex mum Susan Tollefsen has a one year old; can she fit in another baby before her 60th birthday? At 63, Lauren Cohen is a working mum with three children, all under five. Both Susan and Lauren represent a growing number of women around the world defying nature. With no legal age limits on IVF treatment and biological boundaries being pushed ever further, how do we decide what age is just too old to be a new mum?