“Perfection” means absolute adherence or correspondence to a standard of value.
Perfection is possible, and it’s a contextual issue.
If you take a 10-word spelling test, and you spell all ten words correctly, then you have executed the test flawlessly; perfectly.
If a person is declared to be in “perfect health,” it means that every part of his body is working as it should. It does not mean that he is invincible to disease, or that he might not occasionally battle a rhinovirus, and certainly not that he’s automatically going to live forever without a single speck of effort. (It also doesn’t mean that he can’t raise his level of fitness still higher if he does put in the effort.)