I call total BS. Just the numbers they have about other horses are off. They don't even HAVE a verified real age for the oldest horse "Billy" - they say 62, but it's common knowledge that two records may have been mixed up/combined for two "Old Billys". It is NOT considered accurate. In general, the records for oldest horses to be verified are all in their 50's.
And if she had proof that she was 70, she'd be Guinness World Records.