Final answer:
To create the lightest possible break, punctuate the sentence as follows: Ten-year-old Cory Nieves, the youngest CEO in the United States, founded Mr. Cory's Cookies when he was just five years old.
Step-by-step explanation:
The sentence could be punctuated as follows to create the lightest possible break in the normal flow:
Ten-year-old Cory Nieves, the youngest CEO in the United States, founded Mr. Cory's Cookies when he was just five years old.
By using commas to set off the introductory phrase "Ten-year-old Cory Nieves" and the appositive phrase "the youngest CEO in the United States", we create a lighter pause without disrupting the flow of the sentence.
Learn more about Punctuation in English sentences