Possible Clues:

• 'Strapping' young fellow
• He would get rung up over a red turn
• He turns red if he's on the up and up
• He turns red if it's rung in there
• A boy or youth
• After a century he would be dressed
• He turns red on the up and up
• Bar mitzvah, e.g.
• He might get dressed after a century
• A young boy