Historical clue formulations

• Life partner, perhaps? — 2025-12-26
• Person you're in with — 2022-02-26
• Pen pal? — 2020-04-04
• Cooler person to live with? — 2016-05-14
• 5-Down cohabitant — 2015-04-23
• Pen pal? — 2012-07-28