That doesn't stop the natural aging process of the body.
It may have protected him from the injuries that slow a career down but if you look at other 35 years and over players they develop their games to adjust to natural slowing of the body. Vardy won't have that same luxury as his raw ability comes from the fact he seems to have the engine of a formula one racing car.
In comparison to other players over that age bracket you couldn't see him being able to run games like a Zlatan or Giggs as he doesn't have their natural ability, the only player I could see him changing his style to replicate is Ronaldo. I know it's a crazy comparison but Ronaldo was full explosive energy but he changed his game and now he's more like a static number 9 who given space will 9 times out of 10 hit the net.
Can Vardy do that, who knows but it would require his teammates around him to do all the leg work for him and I don't think Rodgers will want to carry a player like that.