In English, your male siblings are "brothers", and female siblings are "sisters", regardless of age.
In Chinese, we differentiate between younger and elder siblings. Your elder brother is 哥哥, younger brother is 弟弟; elder sister is 姐姐/姊姊, and younger sister is 妹妹.
In English, your male siblings are "brothers", and female siblings are "sisters", regardless of age.
In Chinese, we differentiate between younger and elder siblings. Your elder brother is 哥哥, younger brother is 弟弟; elder sister is 姐姐/姊姊, and younger sister is 妹妹.