Historical clue formulations

• Young dog — 2013-01-15
• Whippersnapper — 2008-03-28
• Impudent boy — 1999-10-28
• Young seal — 1998-07-14
• Have puppies — 1997-12-24
• Young lion — 1997-06-12
• Impudent youngster — 1994-09-19
• Young boxer, e.g. — 1994-04-23