Answer: sixty

AnswerCrossword Clue
SIXTYRisky speed.
sixtya number
sixtywith great speed, ease, energy, or zest
sixtyten times six
SIXTYBase of the Babylonian number system
SIXTYThe new 40, they say
SIXTYNumber Roger Maris beat
SIXTYSexagenarian number
SIXTYBabe Ruth mark broken by Roger Maris
SIXTYHighest score achievable by a single dart in darts
SIXTYNearing retirement age, maybe
SIXTY"When I'm ... -four": Beatles
SIXTYThree score
SIXTY...-four dollar question
SIXTYNumber.
SIXTYSemicentenarian's next milestone
SIXTYSpringtime temperature
SIXTYSpeed limit, at times
SIXTYLimit, at times
SIXTYJust passing
SIXTYSeconds or minutes numbers
SIXTYThe smallest number divisible by the numbers 1 to 6
SIXTYMaximum number of marbles at play in a Chinese checkers game
SIXTYFive dozen
SIXTYIt's often done on highways
SIXTYMile-a-minute speed
SIXTYHighest score possible with a single dart
SIXTYThreescore
SIXTYA mile a minute