I think her lyrics really started to go down after I am...

Her early lyrics I find great in terms of putting across emotion. When I read recent ones, I just think "oh an Ayu lyric". It's hard to explain, but I feel like most of her lyrics now sound pretty much alike enough to the point when I read them, even if you didn't tell me who's song it is, I would know Ayu wrote it. Crappy explanation, but whatever.

In terms of being youthful, I also think her newer lyrics sound less mature. But that's just my opinion. :/