If your dog has reached 15 years do you have any tips or is it just genes?

[FairlyIncognito]

I’ve heard that dogs typically live shorter lives than in our grandparents ‘ generation and wonder how to help Ddog live her fullest life.
She is only 3 at the moment and I avoid unnecessary chemicals when can (eg I have tested her for worms rather than routinely worming her .) I don’t know if this is helpful but so interested in older dogs and if anything has helped them live good lives , I know age isn’t everything!

@Boxin , really , I was not aware of that i am sorry if anyone has suddenly thought its ok, I have to say she had a cast-iron constitution, we put this down to her been a stray for at least a few months before she was picked up and frequently hung about the local markets at night scrounging carrots corn and curry !