What is “age appropriate”?

This morning I found this question on my formspring:
“When will your style ‘grow up’? I find it very twee for someone in her thirties?”

I’ve had a few of those recently and even though I know where and who it comes from, I thought I’d answer this as it raises an important question about age appropriated style.

My answer on there was just “I suppose that’s down to your own preconceptions about what people should wear at what age. I am totally fine with dressing like I do, even though I am 31.” 

My opinion is that there is no such thing as age appropriate. What matters is to dress according to who you are and what you love. Style is about freedom and knowing yourself (that includes both your thoughts and your body shape). Style isn’t about age. The only thing age changes is the way we carry our clothes. What I wear now doesn’t look the same on me as it did when I was 20. The vibe is different because I am different.
The one constant is that the way I dress has pretty much always reflected the way I think and what makes me happy. 
I feel that I have reached a level of confidence I didn’t have when I was younger and I am loving the freedom it gives me. I don’t have an eccentric style, but what I wear suits me and makes me feel pretty/happy. To me, that’s what matters. I don’t aim to please others, I don’t aim to follow trends or to conform (or non-conform for that matter). I am free. Are you?
I wrote about this before, so if you are so enclined, go and read this.
I realised after tweeting about this that a lot of you had an opinion about this, so please feel free to say what you think below.