The truth is that age gap can have both positive and negative effects on any relationship. The second reason is that many people think that older partner has something wrong with him or her, and they might not be able to develop a serious relationship with them, or they might be rejected by the society or their family members. The first reason is that some people do not want to accept the fact that there is an age gap between them and their partner, as it makes them feel uncomfortable and older.
One of the most difficult things to do is to accept age difference between two people in a relationship.