That doesn't really make a lot of since though. Why all of a sudden for the younger one? He spend most of those years in command for Microsoft, before focusing on charity work from 2008 and up. (His children would have been roughly 12, 9, and 6 at that time.) So, that may be a part of it but probably not a major part.
Ah, I was under the impression that he had stepped down in 2008. But that was probably from any activity at Microsoft and 2000 was when he relinquished the CEO title. Thank you for clarifying that. It does sound like that may be more closely related than I thought.