No matter what age you teach, your students' learning is not (or rather, should not) be fixed to their age. Therefore, it is important that as educators we appreciate where our students are at in their learning journey and a child's ability to receive and process new stimuli. For, it is best to identify misconceptions and re-direct these earlier rather than later before actions become habitual and more difficult to correct. The best way to gauge this in your classroom is through observation. For example, if a student is beginning to use certain types of punctuation, albeit incorrectly (e.g. apostrophes), then this shows you that the child has an awareness of the skill and will be able to apply new learning of this skill more accurately.
As students progress in age, the academic vocabulary becomes more critical and vast. It is for this reason that starting to use these vocabulary terms in real world learning experiences in the younger classroom will benefit those children, as they get the advantage of hearing, engaging in and applying the vocabulary terms as part of their everyday language from a young age, which in turn should enable their abilities as they move upward through school.