middle and advanced age
Refers to people in their middle to older years, often used in contexts like employment, health, or social welfare.
Policies to promote employment of middle-aged and older people are needed.
Health management becomes more important as one reaches middle and advanced age.
中年 means middle age, typically around 40s–50s, whereas 中高齢 extends into older age groups.
Compound of 中 (middle) + 高齢 (advanced age). The exact historical derivation is uncertain, but the term is a straightforward modern combination.