But others think it’s unfair to blame Type A personality traits and career focus for one’s single status.

“Singles aren’t waiting for life to happen to them,” argues Melanie Notkin, cultural anthropologist and author of “Otherhood: Modern Women Finding a New Kind of Happiness.”

“The same people who invest in their careers while single will probably invest in their careers as marrieds. Staying late at work isn’t something a single person does instead of going on a date with someone they’re into. It’s grit. And grit is a pretty sexy quality in men and women. If you end up with someone with grit, it’s probably because he or she loves you, not because he or she settled for you.”

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