This is an incredibly sweet idea. "Open when you need to know how much I love you; open when you don't feel beautiful; open when you need a laugh; open when you miss me; open when you're mad at me; open when you need a date night, etc.
Sixty Years of Memories. Great idea for my dad for "Don't forget to buy some kleenex before you give someone this gift! This is a phenomenal idea for a birthday gift. Definitely one that would never be forgotten and could be passed down.