Your face does change in your 20s.
Your face continues changing a lot from the day you're born until you're 18 and then after 18 your facial look changes less often.
You'll notice a lot of change in the first few years or so of your life.
As a baby your face is changing as you grow from a baby into an kid and teen and then after the teen years your facial features start slowing down with change.
The facial features will continue changing as you age but it changes less and less and takes longer for your facial features to change.
But as you grow older your face will look different and become shaped differently.
After 20 years it can take 8 to 10 years to really notice a change in your face but when you're 6 to 7 to 8 and 14 and 15 years old you'll notice your face has changed a lot over each year.