Hi Guys,<br/><br/>Could you please clarify why I use "s" in one example and not in the other?<br/><br/>"I'm 26 years old"<br/><br/>"He has a 3 year old baby"<br/><br/>Why is it "years" in the 1st example and "year" in the 2nd?<br/><br/>Many thanks for any help,<br/><br/>Jackie