fourth-year
— Adjective
– English
～ used of the fourth and final year in United States high school or college; "the senior prom"
four-year-old
— Adjective
– English
～ four years of age
five-year-old
— Adjective
– English
～ five years of age
first-year
— Adjective
– English
～ used of a person in the first year of an experience (especially in United States high school or college); "a freshman senator"; "freshman year in high school or college"