The term "age gap" refers to the difference in age between two individuals, typically in a romantic or sexual relationship. It can also refer to the disparity in ages between friends, family members, or colleagues. The size of an age gap can be used as a measure of how much experience, maturity and life experience there is between the two people involved. In some cases, a large age gap may raise concerns about the potential for compatibility, communication, and shared interests. However, it's also important to note that many successful relationships have significant age gaps.