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Well if I'm not wrong, usually when a word has multiple kanjis one of them is
selected as the "main" or more commonly used one.

But is it true that 才 and 歳 are both the "main" kanji for さい?
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2011-07-10T14:33:50.357
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2014-06-25T03:58:32.687
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question
words kanji orthography kanji-choice
Which is the "official" kanji for さい, 歳 or 才?
It seems that 歳 is the "official"character for the age, even though both it
and 才 are reglementary (常用漢字). However, it is too difficult for the pupils
(小学生) who are supposed to learn it since it's a very common word. Therefore,
the different (but _not_ simplified) character 才 is taught instead so that
they can learn a necessary character until they see the "hard" one a few years
later.

So, the "official" one would be 歳. Same goes for 令 instead of 齢
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2011-07-10T14:58:00.027
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I agree with Axioplase, but `歳` is also `とし`, which is also the same reading
for `年`.

If I say, "Because I'm getting old," I will use `歳{とし}だから`。
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2014-06-25T08:32:52.483
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answer