Simply because the number “seven” appears in the Bible does not mean we should ascribe some spiritual meaning to it, for it might merely be an incidental reference, as in the following,
“After he begot Serug, Reu lived two hundred and seven years, and begot sons and daughters” (Genesis 11.21).
“Now Terah lived seventy years, and begot Abram, Nahor, and Haran” (Genesis 11.26).
“So Abram departed as the LORD had spoken to him, and Lot went with him. And Abram was seventy-five years old when he departed from Haran” (Genesis 12.4).
Once anyone gets past the age of seven, then seven or multiples of seven shall show up in their ages, and that only means they have attained that particular age, and nothing more, unless the Lord has made a point about the number seven in someone’s age, then we can explore its meaning.
Therefore, let us learn whatever we can from the Scriptures, in this case with the number 7, but let us not go into wild speculation about numbers that the Bible does not support.