What are the opposite words for overage?

Antonyms for the word "overage" are "underage," "below average," "young," "not enough," and "deficient". "Underage" refers to an individual who is below the legal age for a certain activity, such as buying alcohol or voting. "Below average" pertains to something that falls short in comparison to the norm. "Young" encompasses those who are in their early years of life, while "not enough" suggests that there is insufficient supply of something. Lastly, "deficient" implies that something is lacking or inadequate. These antonyms for "overage" showcase the opposite sides of the spectrum, highlighting the diversity of meanings found in the English language.