I love Halford’s voice but he just can’t hit the notes the way that he used to. Dio maintained his voice very well, and it was magnificent.
Hard to believe Ronnie Dio was born in 1942. Said he never had any formal vocal training.
http://en.wikipedia.org/wiki/Ronnie_James_Dio
Michael Kiske of Helloween fame still has an incredible voice.
https://www.youtube.com/watch?v=08wDeWQqWnw
He started up Unisonic, which also has Kai Hansen playing guitar. It’s sort of a power metal dream team back together.