It depends on what you mean by "age" in English.
If you are referring to the amount of years some person or thing has lived/existed, it would be "age" (with a circumflex over the "a"). For example, "Her age was fifteen years old."
If you are referring to a long period of time, such as a remote century, it would be "epoque" with (with an acute accent over the "e"). For example, "In ages past, men would cower before the lion."
If you are referring to a long period of weathering or development, such as happens to wine or people, it would be "vieillir". (Of course, it would have to be properly conjugated.) For example, "As men age, they drink scotch that has also been well-aged."
If you are referring to long recent period of time, it would be "longtemps". For example, "It has been ages since I saw my best friend."
Chat with our AI personalities