Half of CXXX, Retirement age in old Rome?

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Possible Answers: LXV.

Random information on the term “LXV”:

The Messier objects are a set of astronomical objects first listed by French astronomer Charles Messier in 1771.[1] Messier was a comet hunter, and was frustrated by objects which resembled but were not comets, so he compiled a list of them,[2] in collaboration with his assistant Pierre Méchain, to avoid wasting time on them.
Taken from Wikipedia