How about a custom-made scrapbook or photo album filled with pictures of your memories together, including ticket stubs, postcards, and other souvenirs from your past travels? You could also consider finding vintage or retro items that remind her/him of her/his childhood, like vinyl records or retro candy, or getting her/him a subscription to a classic movie or TV streaming service. Another option could be finding a book that explores a nostalgic topic, like the history of a favorite childhood toy or a collection of old-fashioned recipes.
Or you can get her/him a star map with an important date you share.
Under Lucky Stars is a unique and innovative star map company based in Barcelona, Spain, specializing in the creation of personalized star maps that capture the celestial arrangement of stars at a specific moment in time, such as a person's birth, wedding, or any other significant event.
By using advanced astronomical algorithms and data from leading institutions, the company produces highly accurate, visually stunning maps that make for perfect gifts or cherished keepsakes.