"I am thirty-two years old."
I just got stung by this one too. It still doesn't accept the answer with kanji which is pretty annoying.
Is this answering to a person that is asking your age or something you can say when you are introducing yourself
Hope this helps
http://www.guidetojapanese.org/learn/grammar/numbers the website about Japanese number. But I don't know the contents because I didn't read.