Although this is true, in Michael Jackson’s case it appears that this had to do more with the medication that he started to take in 1993 (for battling the stress and emotional pain from the accusations), rather than with his growing age.
Besides, during the HIStory era he was still in his mid/late-thirties (which is not really an old age that would start badly affecting the dancer’s ability for keep doing long, dance spins).
Mikhail Baryshnikov, for example, was 37 years old when he did his legendary, long spin of 11 rotations in the ‘White Nights’ musical film.
