My wife and I recently celebrated our seventh wedding anniversary. In honor of the occasion, I asked couples who had been married 40, 50, or even 60 years a simple question: What relationship advice would you give to your younger selves?

The participants ranged from a mid-60s couple who had just celebrated their 40th anniversary to a 99-year-old who had just celebrated 66 years of happiness with his bride. The advice captured more than 500 years of earned wisdom from these beautiful relationships.

Here are 25 pieces of relationship advice that everyone needs to hear:

In a separate but related series of conversations, I asked a 94-year-old woman what advice she would give to her younger self.

She delivered this beautiful insight I’ll close with: “When in doubt, love. The world can always use more love.”