I suggest that you be comfortable with the fact that you might spend the rest of your life single. I don't mean that you should stop pursuing a partner, but you should not let it bother if you don't find one. You can live a fulfilling life no matter who you're with.

I know several people who stayed single late in their lives, and they are happy and have many friends. I know some others who married late in life, and they are also happy.