How can I make my 3 and 8 year old cats live longer? What about my 11 year old and 8 year old dogs?

How can I make my 3 and 8 year old cats live longer? What about my 11 year old and 8 year old dogs?
I just want my companions to live a long healthy life =D

Justin W.
let them run around a lot, feed them healthy food, play with them every day. It's that simple =D

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