Well, I always think this is important: if the guests include their friends, there are likely to be some with diet restrictions, so sugar free beverage options are necessary. For instance, if my 60+ year old mom was invited, she is diabetic.

For other ideas, do you want to pick a theme? Based on one of their interests or just a generic birthday theme? When my uncle turned 60 we had only a small family party, but everyone brought him 60 of something.