A gift that felt small at ten can mean everything at thirty. Time changes what things are worth.

Worth is not fixed at the moment of giving. A book, a pocket knife or a plain necklace can be mildly disappointing at ten and turn into one of the few objects you would not sell at thirty, because what changed was not the object but how much of a person it now holds. You cannot predict which one it will be, and neither could whoever gave it to you.

Keep a couple of things whose value is unclear now, and label who they came from. Going the other way, give with that long window in mind. A note tucked inside a gift costs nothing and ages well.