Authorship of the Torah ?

Serious Authorship problem !!!!

(Moses was 80 years old when Yahweh spoke to him and gave him his mission?) 

Moses was eighty years old and Aaron eighty-three when they spoke to Pharaoh. (Exodus 7:7)

"When Moses was forty years old, he decided to visit his own people, the Israelites (Acts 7:23)

Add another 40 years after Moses Moses left for median and Yahweh spoke to him

"After forty years had passed, an angel appeared to Moses in the flames of a burning bush in the desert near Mount Sinai. (Acts 7:30)

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According to Jewish and Christian biblical scholars chapters found in the book psalm were written by Moses. E.g psalm 90 is supposed to have been penned Moses himself :

Matthew Henry commentary (speaking of psalm 90)

This psalm was penned by Moses (as appears by the title), the most ancient penman of sacred writ. We have upon record a praising song of his (Ex. 15, , which is alluded to Rev. 15:3 ), and an instructing song of his, Deu. 32, .

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  • The Treasury of David / Commentary 

A Prayer of Moses the man of God. Many attempts have been made to prove that Moses did not write this Psalm, but we remain unmoved in the conviction that he did so. 

The renowned website biblehub also mentions Moses wrote psalm 90 This is also acknowledge by many other commentators that Moses was the author of psalm 90. 

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Now that we've established Moses was the author of psalm 90 here's where we have a SERIOUS PROBLEM ! Let's read a verse from psalm 90 the prayer of Moses and jump to verse 10 were we have a very  interesting verse which crushes the whole notion of the authenticity of the bible, in contrast psalm 90 and the Torah.

The years of our life are seventy, or even by reason of strength eighty; yet their span is but toil and trouble; they are soon gone, and we fly away. (Psalm 90:10)

Do you see the problem posed from the above verse? (Moses was 80 years old when Yahweh spoke to him and gave him his mission?) 

Moses was eighty years old and Aaron eighty-three when they spoke to Pharaoh.

(Exodus 7:7)

If Moses was 80 years old when his mission started and before that he had no conversation with God, how could the author of psalm who is supposed to be Moses say he's 70 years old and make prayers of God and even write scriptures of God? He wouldn't of been appointed to be a Prophet. 

This is another reason to prove the bible is confused and inaccurate with all its authorship.. This person who wrote psalm would not have been Moses and by the age not even King David since David was a old man himself so who was the author?