The term "less age" is used to describe someone who is younger or less experienced than others. There are various synonyms that can be used to replace this term, depending on the context in which it is being used. For example, the term "junior" can be used to describe someone who is less experienced or has less seniority in a workplace. "Inexperienced" or "novice" can be used to describe someone who is new to a particular field or task. "Immature" or "youthful" can be used to describe someone who is younger or less mature. Overall, there are many different ways to replace the term "less age" depending on the specific situation.