The average age for puberty to start (breast development) is about 10 and a half, and puberty generally lasts 5 years. It's extremely common to gain weight during that time, and lose it after puberty. Of course there are exceptions but the majority of women fall into that range.
I think it all depends on who the person is. When puberty ends all depends on the person and same goes with losing weight after puberty. Some people lose weight after puberty and some gain weight. It all just depends on who you are and your body type.Does losing weight increase your penis size?