Yeah I agree that immortal probably isn't accurate in my opinion. It depends on how liberal you interpret the term "healthy". Is a stab wound bad health? Is decapitation bad health? I'd argue no, but there is a (weak imo) argument that it is.
A stab wound on good health heals better than a stab wound on bad health. Any injuries short of death is still better in a healthy body. I would not want a scratch on a diabetic body. And even if immortality is not on the table, severe chronic illness makes aging disgraceful.
I don't disagree, but my point was a stab wound on a "healthy" versus "unhealthy" body is still a stab wound. If you're able to be injured, the only way you'd be immortal is if you can regenerate from anything. That wasn't part of the "perfect health", so I'm assuming "perfect health" is not immortality like some of the others suggested.
More than that. If time stops around you, you can sleep in every day. You’ll probably get more than 8 hours each night.
Plus your stress will go down, and your health will go up. Both leading to a longer life. If you even used a small portion of your normal sleeping time toward physical activity, you could get very healthy.