Conversation so far:
Who did Britain send to get rid of the French in the Ohio River Valley
The British government sent over a representative, 21-year-old George Washington, to demand that the French relinquish their fort and return back to their own settlements.
how did the French respond to Washington's demand that the French relinquish their fort and return back to their own settlements.
New France refused to accommodate the terms which provoked Washington and the small number of soldiers accompanying him to attack, thus stimulating the French and Indian War in 1756.
when did George Washington become president
The presidency of George Washington began on April 30, 1789, when Washington was inaugurated as the first president of the United States, and ended on March 4, 1797.

Question: how old was the president then
Self-contained rewrite: how old was George Washington when he became president