How about a custom puzzle made from a favorite photo of the two of you or a special place you've been together? There are many websites where you can upload your own photo and they will create a puzzle with varying degrees of difficulty. You could also consider getting him a puzzle mat or puzzle board to make it easier to work on and store his puzzles. For a twist on traditional puzzles, you could also look into puzzle books or games like escape rooms, which involve solving puzzles as a team.
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.