1. Nutritional factors: In modern society, people's living standards have improved significantly, and their diet and nutrition are more balanced. My brother may have been born in a poor family and didn't get enough nutrition like my brother. Therefore, in the process of growth and development, the younger brother may absorb more nutrients, thus promoting the growth of height.
2. Medical conditions: My younger brother was born in a period of relatively underdeveloped medical conditions, and may not get enough medical security like his younger brother. Some diseases or health problems may affect the growth and development of his younger brother, resulting in his height being inferior to that of his younger brother.
3. Age factor: Brother and younger brother may have a certain age gap. With the growth of age, people's height will also change. So even if the elder brother is taller than the younger brother at the peak of growth and development, the younger brother may be taller than the elder brother over time.
It should be noted that the above are only some possible reasons, and the actual situation may vary from person to person. Height is the result of multiple factors, including heredity, environment, lifestyle and other factors.