anniversaries, birthdays and parties in general put you always in a bad mood, why?

Kaspar: Buon Ferragosto, doting ... anniversaries, birthdays and parties in general put you always in a bad mood, why?
Sergio: Why repeat and emphasize constantly the years go by, announcing the approach of old age and I hate old age ...
K: Old age ... The Greeks and Romans esteemed very old age ... remember the "De senectute" Cicero?
S: Yes, I remember ... I do not understand, though, what's good in a period of their lives burdened by disease and marked by the expectation of death ...
K: Yes, it is true, you will never again say "Happy Birthday" ...
S: Well, good, shut up!