An Old Hairline

This is a playful way of saying someone is balding, implying their hairline is receding so far back that it's as old as the speaker's grandfather.

• Hairline
• Grandpa
• Family
• History
• Relationship
• Appearance

• Your forehead and hairline are like friends; they go way back.
• Your hairline goes so far back it went back to when Earth was created.