Historical clue formulations

• Feature of a May-December romance — 2025-06-13
• Separation in some relationships? — 2025-01-30
• Common reason for a missed reference — 2024-10-18
• Lovers' divide, maybe — 2024-09-27
• Generational divide — 2024-07-18
• What might come between May and December? — 2024-03-28
• Significant feature of a May-December romance — 2023-08-06
• It's 2.3 years for the average heterosexual American couple — 2023-03-26
• A big one may be hard to overcome in a relationship — 2022-11-16
• Generational divide — 2021-10-03
• Sort of spousal separation — 2020-07-18
• Space in a relationship — 2019-09-17
• Just one year, for Venus and Serena Williams — 2018-09-24
• Feature of a May-December marriage — 2015-07-20
• It's wide in a May-December romance — 2013-10-28
• Possible barrier to romance — 2012-04-22
• Relationship disparity, perhaps — 2011-08-14
• Feature of a May-December romance — 2009-07-27