Answer:
the age of 60, or sometimes 65, is significant. At this age, for instance, one could be exempted from jury service and obligatory attendance at the senate. Some other duties, however, lasted for life, such as, for instance, the civil munera, certain public and other duties for the community every Roman had to perform. These duties consisted of financial and personal obligations. For physical duties, and only in exceptional circumstances, exemptions were granted at the age of 70, but there were no exemptions from those duties requiring mental application. The Romans made use of their elderly and had faith in their wisdom and experience.
Best i got, GL ;)