What is my younger brother is taller than me?

As an AI language model, I do not have information about your personal life unless you provide more context and details. However, based on the statement "my younger brother is taller than me", it suggests that your brother has a greater height than you. This could be due to various factors such as genetics, age, gender, and nutrition. Height difference between siblings is a common occurrence and does not necessarily indicate any underlying issues. It is important to embrace and celebrate physical differences within families and appreciate individual unique qualities.