Five Star Gift Ideas

Here are some personalized gift ideas for your grandson who is a fan of Robert Downey Jr.:

1. Iron Man T-shirt: Surprise him with an Iron Man T-shirt, which features Robert Downey Jr. as the superhero he plays in the Marvel Cinematic Universe.

2. Autographed Picture: You can look for an autographed picture of Robert Downey Jr. to add to your grandson's collection of memorabilia.

3. Iron Man Funko Pop: Funko Pop figures of Robert Downey Jr. playing Iron Man would be a great addition to your grandson's collection.

4. Iron Man Mug: You can consider gifting him an Iron Man mug or water bottle to use, which will remind him of the superhero movies and Robert Downey Jr. every time he uses it.

5. Iron Man Hoodie: Another option is to get him an Iron Man Hoodie that he can wear while playing or just lounging around.

6. Iron Man Comics: You could also consider gifting him a few classic Iron Man comics.

7. Robert Downey Jr. Biography: If he's an avid reader, you can gift him a biography of Robert Downey Jr. or even an autobiography written by him.

8. Iron Man Drones: A cool gift idea would be to get him an Iron Man Drone, that will allow him to fly a model drone that looks like Iron Man.

Hopefully, these gift ideas will help spark some inspiration for a personalized birthday gift for your grandson.

Or you can get him a star map with the date when he was born.