Do you think puppy fat still exists into your late teens and early 20's?

I'm 19, everyone says I look 16. I have a kind of childish look and I'm not fat but I guess maybe a little chubby... I'm 5 ft 7 and around 120 pounds. I keep worrying about it and my mom told me that normally around my age it's normal to be a little bigger and then when you get to 21 or 22 the weight usually comes off (I have two older sisters)... like puppy fat right? I was thinking about it, look at jennifer aniston in first series of friends, she was chubbier then in series 8 or 9... or other celebrities when they were around my age... or is this just something my mom said to make me feel better? Am I too old to call it puppy fat anymore?
Do you think puppy fat still exists into your late teens and early 20's?
Post Opinion