Here are some quotes that you can use for your parents' anniversary:

- "Thanks, Mom and Dad, for setting an extraordinary example of lifelong love."
- "Marriage is the golden ring in a chain whose beginning is a glance and whose ending is Eternity." - Kahlil Gibran
- "You’re the parents all kids hope to have."
- "True love doesn’t happen right away; it’s an ever-growing process. It develops after you’ve gone through many ups and downs, when you’ve suffered together, cried together, laughed together." - Ricardo Montalban
- "Where there is love there is life." - Mahatma Ghandi

I hope these quotes help you. Let me know if you need anything else.