"... likely to not see ..."

[Odessa Dawn]

I agree that you are more likely to not see the hyphens in the phrase "ten year old" in common writing today. Hyphens should be used when they add clarity, but this is such a common phrase that clarity is not usually impaired by their absence.
https://www.usingenglish.com/forum/ask-teacher/186813-ten-year-old-girl.html

Is this an example of split infinitive?

4. Many teachers in 2012 would NOT call "I asked him to not do it" incorrect.
https://www.usingenglish.com/forum/ask-teacher/178470-ask-him-not-do-ask-him-not-do.html

As James stated in one of his insightful posts that split infinitive is acceptable nowadays. I just want to work it out.
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[SoothingDave]

Yes, it is.