One idea could be to get him the complete DVD box set of How I Met Your Mother so he can re-watch his favorite episodes whenever he wants. Alternatively, you could also get him a HIMYM poster to hang in his office or man cave, or a mug with his favorite character's catchphrase on it. For a more sentimental gift, consider creating a custom scrapbook or photo album filled with pictures of the two of you with How I Met Your Mother themed decorations and captions. Another idea is to buy him a printed t-shirt or hoodie with HIMYM references.
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.