For Johnson , he would have to continue to play , stay healthy and maintain his edge well into his mid-40s to see his 300th win .
If Glavine stays healthy , he could hit the milestone by his 40 birthday .
For Johnson , he would have to continue to play , stay healthy and maintain his edge well into his mid-40s to see his 300th win .
If Glavine stays healthy , he could hit the milestone by his 40 birthday .