How old is too old to believe in santa?

Saw a parent on facebook making fake santa footprints in his house and the caption said my 16 year old still writes letters to santa, “laughing face emoji”.

In my opinion 16 is way too old to still believe in santa. If your kid believes in santa for too long you should tell them the truth and if they still believe in santa after like 13 or 14 you should be concerned about them having a mental disability.

Do you agree or disagree that a 16 year old believing in santa in some what alarming?

How old is too old to believe in santa?
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