Related Clues:

• Silver, for example, apparently causing disparity between young and old?
• Romantic obstacle
• May-December romance issue
• May-December romance feature
• Different age: one parting as a consequence of this?
• Just one year, for Venus and Serena Williams
• Such as divides old man and young woman, endlessly arising
• Possible source of a romantic power imbalance
• Dad's flipped about scrambled egg -- a difference between him and mum?
• Space in a relationship
• Generational separator
• Difference in years, for example, between a girl's first and a chap's last
• Sort of spousal separation
• Compatibility obstacle, perhaps
• What separates the men from the boys?