"far too old"?

Is it correct to make a sentence like "far too old/young"?

Cuz most of the time when I see the phrase "far too something", it's usually applied to describe an instance or a situdation, not a person; for example, "The iBT test is far more difficult than the original PBT test." or "The situation will be far too complex for a kid like you to tackle with'' and alike, though when I typed in the three-word phrase on the google searching bar, the results did seem to indicate that it is applicable when applied to describe someone's age, but I still can't be too sure if it's correct.

I just want to make sure.

Thanks for your help at it in advance.