If the comment really helps you in this case, why don't you make the code more like the comment?
int age_of_user; or
That is the better way, in my opinion, since the comment is not necessary and therefore you cannot forget to change comment when the code changes.
"When you feel the need to write a comment, first try to refactor the code so that any comment becomes superflouus." - Martin Fowler
That's a good quote!
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