VAYELECH (and he went)

Deuteronomy 31:1 And Moses went and spoke אֶת־ these words to all Israel. 2 And he said to them, I am 120 years old this day; I cannot go out and come in anymore: and ויהוה said to me, You will not cross over אֶת־ the Jordan this day. C-MATS Question: Why did Moses say “I am 120 years old …