有多种形式,如：
Jim is older than Kate.
Jim is two years older than Kate.
Jim is not as / so young as Kate.
Jim is thirteen years old and Kate is eleven years old.
也可以把KATE 写在前,如
Kate is younger than Jim.
Kate is two years younger than Jim.
Kate is not as /so old as Jim.
Jim is thirteen years old and Kate is eleven years old