Armaghan Ali answered Well age doesn't really matter much if your body mass is showing a positive sign. But (but is always a scary part of the convo) you should try a little exercise in the mornings, squats and what not, just to keep things in control.
Cookie Roma answered Age has very little to do with it my youngest daughter (now 20) weighted about 150 when she was 15. Of course she was 5' 11" so that was great.