well
I've done some research in that area--admittedly, a number of years ago--and found no real bias against older animals (my study focused on 8,9, and 10 y.o.) They win their fair share, and often pay a reasonable dividend, due to the age bias of bettors.
The only information I took away from that study was the vulnerability of those horses to muscle soreness. They need to be brought back to racing form rather gingerly...
tlt-
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