How old was Benjamin when he came to Egypt ?

A little boy, child?

And we said unto my lord, We have a father, an old man, and a child of his old age, a little one (Benjamin); and his brother is dead, and he alone is left of his mother, and his father loveth him. (Genesis 44:20)

And we said to my lord, 'The boy (Benjamin) cannot leave his father; if he leaves him, his father will die.' (Genesis 44:22)

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A Grown man with Children of his own?

These are the names of the sons of Israel (Jacob and his descendants) who went to Egypt: Reuben the firstborn of Jacob. (Genesis 46:8)

And the sons of Benjamin: Bela, Becher, Ashbel, Gera, Naaman, Ehi, Rosh, Muppim, Huppim, and Ard. (Genesis 46:21)