Every single situation is not the same.
Some people have the single situation of being swept off their feet and living happily ever after. Some become "baby mamas" or "single parents" before being married to. Some have a business arrangement where the couple have a business together and it is lucrative, so they are better off being married. Some are what is known as "arrangee marriage," where the single female agrees to marry the single male she's never met before. And there's where you understand the man wants your money and that's fine, because you need to be married.
Each country has their marriageable age.
What's your country's marriageable age?
What's your single situation?
Do you wish to change it?