I understand on a general note, but it's not good advice when given to a 30+ year old woman who is alone, without family or friends and wants to raise a family. And it's advice mostly given in THOSE cases. Totally pretending the biological clock doesn't tick.
Besides, the same people that dish this advice are the first to claim that most humans are not made to be alone, and that other humans, significant others, are not just "nice additions" but crucial to one's psychological wellbeing.
Plus, women of my generation and prior, are fulfilled more by relationships than a career and hobbies. So they would need a huge change in outlook, values and everything in their personality, which is rare to attain and takes ages, before they can benefit from such advice.
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There are two means of refuge from the miseries of life: music and cats - Albert Schweitzer