C r B ..........................................................
Just to add a couple of remarks to Konrad509's answer.
Yes, one of the right answers is:
わたしはじゅうさいです。
[watashi ha juu-sai desu.]
In kanji it looks like this:
私は十歳です。
or
私は十才です。
If you wanted to customize your sentence a little bit then I would suggest changing the first person pronoun to something else. Therefore, if you're a girl, you might to use あたし [atashi] instead of わたし (私) [watashi]; if you're a teenage boy who wants to sound cool on the other hand, you might want to use おれ (俺) [ore].
Also you might want to add よ [yo] at the end of the whole sentence to sound more amiably.
I hope that it clears everything up for you. If you had more questions, you can just write to me personally ;)
Cheers!
The cellular respiration processes of all living cells make use of the coenzyme Nicotinamide adenine dinucleotide (NAD). It plays a key role in energy metabolism by accepting and donating electrons. The low energy form NAD+ shown at left is raised to the high energy form NADH.
Some would say how they have big strong wings but they can not technically fly.