First, the older a conductor, the better. Second, the best ones are dead, but there are a few old ones left. Third, there are many young conductors who will in time age, achieve greatness and die (not necessarily in that order). Finally, a new edition of my book comes out next week.
All of which is fine, but don't lament the lack of young conductors. There are plenty of us just waiting for a few grey hairs before we can be taken seriously.