Eternal youth is a phrase often used to describe the desire for a youthful appearance and energy that never fades. Synonyms for this phrase include perpetual youth, agelessness, timeless youth, and everlasting youth. These terms are often associated with fantasy and mythology, as they imply an impossible state of being. Other synonyms for eternal youth may include unchanging youth, immortality, and perpetual adolescence. These words are often used in literature and popular culture to describe supernatural beings or characters who never age or grow old. Ultimately, the desire for eternal youth speaks to people's longing for youth, vibrancy, and vitality, even as they age and face the realities of life.