how old can they go?

["guest@endurance.net" <guest@endurance.net>]

Kristine Doucet kris@pubnix.net
The mare I ride is 17. This will be her 2nd 50. She is in super
shape and always wants to go. Next year we were considering a 100.
 At 18 years old. Is this crazy?

So my question to all is how old can they go?

Thanks for the replys.
Kristine Doucet
Montreal


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