One idea could be to create a crossword puzzle just for him, using inside jokes or references to your relationship. You could print it out or have it made into a poster, and it could be a fun activity for him to complete. Another idea could be to buy him a crossword puzzle book, or a subscription to a crossword magazine. You could also consider a gift that's related to his favorite crossword puzzle, such as a mug or t-shirt that has a famous crossword clue or answer on it. Finally, you could also consider planning a crossword-themed date day, where you solve crosswords together and maybe even try to create your own.
Or you can get him a star map with the date when he was born.
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.