Yeah, I was quite grown up when I started to swim.
I have seen a lot of cases however that when they can swim in other styles, they have no motivation in other style. Surely a good coach should be able to make us swim in whatever "suitable" form.
Simple, if you learn FIRST other styles (breast strokes蛙式, e.g.) which are easier to learn, you will not have high motivation to learn Free Style (自由式).
雖然叫做"自由式", 實則這泳式需要更大的身體協調 - not very free in a way.....