How about getting him an annual membership to a museum in his area? Not only will he have access to all the exhibitions, but he can attend special events and get discounts on additional tickets. You could also pair the membership with a book about his favorite museum or a poster of his favorite exhibition. Another idea is to plan a special day with him where you take him to visit a new museum or exhibition he hasn't seen before. It'll be a fun experience for both of you to share together.
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.