Currently:
Your BMI result is:
24.94
You are in the healthy weight range.
From my late teens early 20's when I was working full time, at Uni full time and out clubing at least 4 nights a week and slept on tube trains:
Your BMI result is:
15.80
Your weight is in the range that is classified as underweight
www.bbc.co.uk/health/healthy_living/your_weight/bmiimperial_index.shtml