Middle age is a term that refers to the period of life between youth and old age, generally considered to be between the ages of 40 and 60. There are several synonyms for middle age, including midlife, middle years, and the middle stage of life. Other synonyms might include the "golden years," the "prime of life," or the "peak years." Depending on the context, middle age might also be referred to as the "midpoint," the "heart of life," or the "midlife crisis." Regardless of the specific terminology used, middle age is typically a time of significant change and reflection as individuals navigate the challenges and opportunities of their middle years.