Watch his live videos or attend one of his concerts - the man's voice has hardly changed and his songs still sound amazing. Compare to Elton John (who lost his voice like 20 years ago) or many of his contemporaries.
https://youtu.be/wDqy3-eEVLM https://youtu.be/KZWMvFmA_BE
Any other examples of aging legends who can still carry a tune and hit most of those notes with a strong voice?