How about giving him a ticket to a classic car show in your local area? You can make it more personal by offering to join him and make a day of it. If he enjoys reading, you can also give him a book on classic cars, like "The Complete Book of Classic Muscle Cars" by Mike Mueller or "Classic Cars: An A-Z Guide to the Best Classic Cars in the World" by Quentin Wilson. Another idea is to get him a gift certificate to a local car detailing service so he can get his own classic car looking just as pristine as the ones he admires at the car shows.
Or you can get him a star map with the date when he welcomed you in this world.
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.