青 (qīng) is an adjective that can mean 'green' or 'blue', depending on context — it's the classical Chinese color word for the blue-green spectrum (e.g. grass, sky). As 'young', it's used in compounds like 青年 (young person) and 青春 (youth), not as a standalone adjective for people. Contrast with 绿色 (lǜ sè, the modern word for green) and 蓝 (lán, the modern word for blue).