Conversation so far:
what happened to John Marshall during the Adams administration?
John Marshall accepted appointment to a three-member commission to France
who were the other 2 members of the three-member comission to France John Marshall was appointed to?
Charles Cotesworth Pinckney and Elbridge Gerry
what was the three-member commissionto france with John Marshall, Charles Cotesworth Pinckney and Elbridge Gerry in charge of doing?
help bring an end to attacks on American shipping
what were John Marshall Charles Cotesworth Pinckney and Elbridge Gerry  negotiating about with France?
conduct diplomatic negotiations
was John marshall a successful diplomatic negotiator?
did John marshall do anything else during the Adams administration besides negotiate diplomacy with france?
Adams appointed John Marshall to the Supreme Court.
did John Marshall win the seat in the supreme court?
how long did John marhall serve as Rep?
June 13, 1800 to March 4, 1801

Question: how old was he when he took office?
Self-contained rewrite: how old was John Marshall  when he took office in the supreme court?