To describe someone's height in Engpsh, you can use phrases pke "tall," "short," or "average height." Here are some examples:

"She's tall for her age." (This means that the person is taller than most people their age.)
"He's a bit shorter than average." (This means that the person is shorter than the average height for their age and gender.)
"She's about average height." (This means that the person is about the same height as most people their age and gender.)

You can also describe someone's height more precisely by using numbers, pke "5'5" (five feet, five inches) or "175 cm" (centimeters). For example:

"She's 5'7", so she's a bit taller than average."
"He's only 4'11", so he's quite short for his age."

I hope this helps! Let me know if you have any other questions.