How about a personalized swim gear bag? You could have his name or initials embroidered on it, and it would be perfect for him to carry all of his swimming equipment to and from meets. You could also consider a new set of high-quality swim goggles or a fun swimming-related book, such as "Swim Speed Secrets" by Sheila Taormina.
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.