你多大了? 

how old are you? *在美国，出于礼貌是不问别人的年龄、体重和身高的。除非是自己比较熟悉的人，最好回避提这些问题。
i'm not old enough to drive. (我还不到开车的年龄。)
how old are you? (你多大了?)
i can't drink alcohol yet. (我还不能喝酒。)
how old are you? (你多大了?)
may i ask how old you are? (我可以问您的年龄吗?)
may i ask your age? (我可以问您的年龄吗?) *比较礼貌的说法。

我48岁。 
i'm forty-eight.

你的体重是多少? 
how much do you weigh?
what's your weight?

75公斤左右。 
about seventy-five kilograms. *美国不用公制单位，而用pound磅(1磅大约453克，复数是pounds)。

我重164磅。 
i weigh a-hundred-sixty-four pounds.
i weigh 164 ibs. *ibs.读为pounds。

你有多高? 
how tall are you?
what's your height?

1米80左右。 
about one-hundred-eighty centimeters. *美国不用公制单位，而用foot英尺计算(1英尺大约30厘米，复数是feet；1英大约是2.5厘米，复数是inches)。

我身高5英尺3寸。 
i'm five feet three inches tall.
i'm 5′3″ tall.
i'm five three. *口语中常用这种省略说法。