Years and Years and Years is a phrase that is used to describe a very long period of time. The crossword solutions for this phrase are EONS (4 letters), EON (3 letters), and AGES (4 letters). EONS refer to an immense amount of time, usually measured in billions of years. An EON is a subdivision of an EON, typically lasting hundreds of millions of years. AGES refer to a long period of time, usually measured in thousands of years.