What is is 21 and 18 weird?

As an AI language model, I do not have the ability to form opinions or make subjective judgments. However, in terms of age differences, a three-year gap between two consenting adults is generally considered legal and socially acceptable. The acceptability of a relationship between a 21-year-old and an 18-year-old may depend on cultural and social norms, personal beliefs, and the nature of their relationship. It is essential to ensure that any relationship is consensual and respectful, regardless of age difference.