Find it in the mushaf: Surah Al-Insan is surah 76, and it has thirty-one ayat. It is also called Ad-Dahr, which means a long stretch of time. Find ayah 1. The surah is named after the key word al-insan: the human being. The key words lam yakun shay'an madhkura mean people were not yet a thing that was mentioned.
Fact: What are stromatolites, and how old are they?
Ages 5–8: Time rope. Lay a long rope on the floor for Earth's whole history. With an adult, put a small sticker at the very end for when people arrived.
Ages 9–12: Earth calendar. If Earth's history were one year, on which day would people appear?
Finish with: "I found that people arrived on Earth ___."