[Yuffa]

It really depends on life experience as well. Not talking about age difference because that is totally irrelevant.

For example if your girlfriend is still in school, it would be hard for her to relate to your problems with work. Even if she has worked retail before, the POV of an employee vs a business owner is completely different. Your social circle really only start to expand after you get out of school. So you might have friends in all different walks of life where her friends are all from school.

Differences also come in if she is still living at home vs you who are probably living on your own.

So don't jump to conclusion so quick just yet. Try to explore what she is into as well and try to understand what are her passion. Find topics that she can relate to and explore new things together.