Charles Ellicott Commentary Jeremiah 1:3

"It came also in the days of Jehoiakim the son of Josiah, king of Judah, unto the end of the eleventh year of Zedekiah, the son of Josiah, king of Judah, unto the carrying away of Jerusalem captive in the fifth month." — Jeremiah 1:3 (ASV)

It came also ... —The short reigns of Jehoahaz (three months) and Jehoiachin or Jeconiah (three months also) are passed over, and mention is made of the more conspicuous reigns of Jehoiakim (eleven years) and Zedekiah (also eleven). Assuming Jeremiah to have been about twenty when the prophetic call came to him, he was sixty or sixty-one at the time of the captivity.