I don't believe horses are living into their forties.
I do believe the stats on death dates in the April "Hoof Beats" are very misleading.
I ALSO DON'T BELIEVE THAT ABOUT 99% OF ALL DEATHS HAPPENED ON THE FIRST DAY OF THE MONTH AS IMPLYED BY "Hoof Beats" stats.
I don't know the answer, but somethling is off gait.