I'm 28, not married, and not planning on it in the near future. For now I'm happy being single, uncommitted and dating around. However if that is what makes you happy, and you are *sure* thats what you want, go for it!
I'm somewhat handicapped by the fact that I definitely don't want children, and many single women my age or above are starting to have biological clock thoughts.
Just never had any desire to pass on my defective DNA ;)