"One's high school years" refers to the period of time when someone is attending high school, typically from around the ages of 14 to 18. Full definition
If you took a German class in high school years ago, it doesn't really count as an asset. (blog.kickresume.com)
Parents may be up to speed on what vaccines their children need for kindergarten, but may be less sure during high school years, a new national poll suggests. (uofmhealth.org)
I went back to school; I had dropped out of high school years before. (premierchristianity.com)