The term 'Rock of AGES' is a phrase that has been used for centuries to refer to God's everlasting love and protection. It is also the title of a popular hymn written by Augustus Toplady in 1763. The crossword solution for this term is 'AGES, ' which is a four-letter word meaning a long period of time. This phrase is often used to describe something that has been around for a very long time, such as God's love and protection.