How much of this is language? In a child’s mind, is the word “age” for example tied to being “X years old”, while that may still intuitively understand the conc

How much of this is language? In a child’s mind, is the word “age” for example tied to being “X years old”, while that may still intuitively understand the concept of “age”? I assume they took language into account but can’t access the article. Does anyone have more info about the methodology?