Their voice is their instrument and very few people can maintain it for a long time. There will be exceptions to that rule. the ones people point out to show its possible. But vast majority will find it not possible to reach the high notes.
This version sung by original artist is different to how original sounded, as its recorded 36 years later:
Original:
99% of vocalists can''t reach the notes they hit in their youth. Its just how it is. Another example could have been one of the lead singers of Helloween can't sing the notes as long as he once could. Still a good singer but the songs just aren't sung same way anymore.
Its easier for players of other instruments to keep going into their late age, as you can replace their instruments with newer ones. But singers are reliant on biology and as yet can't replace their vocal chords.
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