I’ve let this go for too long. Here’s a cheerful bit by Sophocles, who wasn’t a bitter old man when he wrote this.
Not to be born surpasses every lot;
And the next best lot by far, when no one is born,
Is to go back whence he came as soon as possible;
For while youth is present bringing vain follies,
What woes does it not have, what ills does it not bear
Murders, factions, strife, war, envy,
But the extreme of misery is attained by loathsome old age -
Old age, strengthless, unsociable, friendless,
Where all evils upon evils dwell together.
- Sophocles, Oedipus at Colonus