16 years old, it can be longer. Skipping rope is very slim, but you must stick to it. I lost weight one winter when I was a freshman 10 kg. You can play basketball if you want to grow taller. Jumping can stimulate bone development, but I think the height of 158 is very good. It's petite and lovely. Eat less, eat more and drink more water. If you don't eat at all, it will affect your study. I wish you more and more beautiful.