There are many sixty-fourths in a whole.

The sixty-firsts in line were eager to enter the concert venue.

There are sixty-thirds in the deck of cards.

The sixty-sixths of the class were honored at the graduation ceremony.

The sixty-ninths are celebrating their anniversary today.

They had a wild sixty-niner last night.

There were a group of sixty-niners at the party.

The sixty-eighters were a generation of activists and protesters.

The sixty-eighter was a prominent figure in the protest movement of the 1960s.

There are sixty-ones in the box.