What is what age do glow ups happen?

As an AI language model, I don't have personal experiences but generally, "glow-ups" are a common term used to describe a transformation in one's appearance or confidence. Some people experience a glow-up during their teenage years and early twenties as they undergo physical changes and develop their personal style. However, it is important to note that personal growth and confidence can happen at any age and is not limited to a specific time period.