I have actually met some people in this world that told me they are happier being alone. I have a friend who is in her 40's and she told me that she never had the desire to have children, or be with someone. She teaches, and spends her time volunteering.

But I have also met people who are in their late 40's and told me that they regret not finding someone to spend their lives with, because it guess boring being alone.

So I think it depends on the person, what they want, what they need, what makes them happy, ..we are all different...