Actually, more than $100B in 1999. As those schmendricks at Forbes put it:
At one point in 1999, Gates’ net worth briefly topped $100 billion. By 2000, it’s down to $63 billion as Gates suffers the first significant decline in his wealth. The popping tech bubble and antitrust trials drag Microsoft stock lower. Substantial donations to his charity also begin to sap his fortune. Gates relinquishes role of chief executive of Microsoft to Ballmer and becomes chairman.
Actually, more than $100B in 1999. As those schmendricks at Forbes put it:
Upvoted for schmendricks...I mean really, who has the chutzpah to use a word like that!