What is older brother?

As an AI language model, I don't have any personal information regarding who your older brother is. However, in general, an older brother refers to a male sibling who was born before the person speaking. Older brothers usually have a protective and supportive role in the family, especially towards younger siblings. They can act as role models and sources of advice and guidance for their younger siblings. Older brothers may also have a significant impact on their siblings' personalities, interests, and overall development.