There are standards/ranges set by society. However, individuality cannot and should not be ignored. Marriage is a huge life-altering decision. It’s not wise to make such a decision when you don’t feel ready or mature enough to handle the responsibilities that come with marriage. So you should get married when you as an individual feel you’re ready for it. For some that is at age 20, for some it’s 25. And I also believe that everyone has their own unique destiny and there is a time for everything. And when the times comes, inshaAllah things will fall into place.