How old was Jacob was he entered the land of Egypt?
Jacob was 130 years old when he entered the land of Egypt. This is revealed explicitly in Genesis 47:9 when Jacob is introduced to Pharaoh:
And Jacob said unto Pharaoh, The days of the years of my pilgrimage [are] an hundred and thirty years : few and evil have the days of the years of my life been, and have not attained unto the days of the years of the life of my fathers in the days of their pilgrimage.
Genesis 47:9