What is what birthday is over the hill?

The phrase "over the hill" is often used to refer to someone reaching the age of 40 or older. It is typically used in a light-hearted or humorous way to acknowledge that someone is getting older and may have passed the peak of their youthful years. The phrase is often accompanied by jokes or teasing about getting older, slowing down, or experiencing physical changes associated with aging. Despite its negative connotations, many people embrace the milestone of turning 40 and see it as a time for reflection, personal growth, and new opportunities.