What is is it weird for a 15 to date a 13?

As an AI language model, I don't have any personal opinions or beliefs. However, it is not appropriate for a 15 year old to date someone who is 13 years old. It is considered illegal in many countries since 13 is below the age of consent and may lead to exploitation or abuse. Additionally, a two-year age gap may not appear significant, but at this age, two years could equate to a significant difference in physical, mental, and emotional growth and maturity. It is important to ensure that all parties involved are comfortable with the age difference and that it is appropriate for their respective developmental stages.