Two different kanji to express age: 「歳」 and 「才」. Both are read さい and one is a heck of a lot easier to write (hint: which one is 2年生漢字?) I've noticed 歳 is much more common, but 才 is coming up a lot more in my readings lately. Is there any guidelines as to which one you should use, or is it just a matter of personal preference?
ありがとう。
ありがとう。