There's a lady who lives around my block, and her yorkie is 17!
Little furbaby is about 5lb and still looks like a pup.
no limping, no cataracts, no health issues whatsoever, except some hairless…
I think lady feeds her science diet & gives her lots of exercise( I see her walking her everywhere) other than that nothing special.
My dear grandmother lived till 97, despite drinking & heavy smoking(2 packs a day
) all through out her life. She never had any health issues.
I believe gene must play great role in one's health.