Strong’s Greek
G5063 — tessarakontaetes
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
τεσσερακονταετής
tessarakontaetes — pronounced tes-sar-ak-on-tah-et-ace'
from 5062 and 2094; of forty years of age:--(+ full, of) forty years (old). see GREEK for 5062 see GREEK for 2094
2 occurrences in the KJV.
Acts 7:23
And when he was full forty years old, it came into his heart to visit his brethren the children of Israel.
Acts 13:18
And about the time of forty years suffered he their manners in the wilderness.