Why do they call willy a kid in death of a salesman?

In Arthur Miller's "Death of a Salesman," Willy Loman is often referred to as a "kid" by his family, particularly by his son Biff. This term reflects Willy's youthful dreams and his struggle to reconcile his aspirations with reality. It also signifies a sense of vulnerability and innocence, highlighting Willy's failure to mature and adapt to the harsh truths of life. Ultimately, the use of "kid" underscores the tragic nature of Willy's character as he grApples with unfulfilled potential and disillusionment.