THEOSISJohn Chrysostom
Joseph and his father Jacob were presented to Pharaoh. The Pharaoh inquired of Jacob, "How many years are the days of your life?" Noting that Jacob appeared as a venerable elder, he sought to know the length of his years.
Genesis 47:8Meaning & Commentary from the Church Fathers
And being asked by him: How many are the days of the years of thy life?
וַיֹּ֥אמֶר פַּרְעֹ֖ה אֶֽל־יַעֲקֹ֑ב כַּמָּ֕ה יְמֵ֖י שְׁנֵ֥י חַיֶּֽיךָ׃
The Church Fathers on this verse
2 Church Fathers comment on this verse
Philaret of Moscow (Drosdow)
How many years comprise the days of your existence? It may be that he inquires due to the perception of Jacob's image, where his later years appeared to be significantly advanced.