You are 42 and five foot seven how much should you weigh also i am a female?

I'm 5' 5" and older than you. I feel best at 133. It depends on what you're comfortable with. I think anywhere between 120 and 140 would be good for you. It's a wide range but everyone is different.

Source: http://www.doctor-dubai.com/health_and_nutrition/health.aspx?catId=1&pageNum=3