Here is a bunch that fit together nicely. That discussion of getting older, retire or not some re old so to many uses of "he": 

No matter how far advanced you are in years, you'll never be as young as you are right now.

"After thirty a man wakes up sad every morning." —Ralph Waldo Emerson

"No snow falls lighter than the snow of age; but none lies heavier, for it never melts." —L.N. Child

"When we are young, we are slavishly employed in procuring something whereby we may live comfortably when we grow old; and when we are old, we perceive it is too late to live as we proposed." —Alexander Pope

"Every one desires to live long, but no one would be old." —Jonathan Swift

"Nothing is more disgraceful than that an old man should have nothing to show to prove that he has lived long, except his years." —Seneca

"A person is always startled when he hears himself seriously called old for the first time." —O. W. Holmes

"Age that lessens the enjoyment of life, increases our desire of living." —Oliver Goldsmith

"Men of age object too much, consult too long, adventure too little, repent too soon, and seldom drive business home to the full period, but content themselves with a mediocrity of success." —Francis Bacon

"Without fullness of experience, length of days is nothing. When fullness of life has been achieved, shortness of days is nothing. That is perhaps why the young . . . have usually so little fear of death; they live by intensities that the elderly have forgotten." —Lewis Mumford

"As we advance in life, the circle of our pains enlarges, while that of our pleasures contracts." —Sophie Swetchine

"Old age adds to the respect due to virtue, but it takes nothing from the contempt inspired by vice; it whitens only the hair." —J. P. Senn

"Old age is a tyrant, which forbids the pleasures of youth on pain of death." —François de La Rochefoucauld

"Forty is the old age of youth; fifty is the youth of old age." —Victor Hugo

"How many fancy they have experience simply because they have grown old." —Stanislaus

"Childhood sometimes does pay a second visit to a man; youth never." —Anna Jameson

Feeling your age, Rupert?

60 in March! too much talk of retirement

"Remember, amateurs built the Ark. Professionals built the Titanic."

— Alastair Humphreys on going for it even if you're not really ready (though I assume the quote itself is rather old)

One of my all-time favorites that I had occasion to think of today...

"There's a time to think, and a time to act. And this, gentlemen, is no time to think."
— John Candy as Sheriff Bud Boomer in Canadian Bacon.

"People don't want accuracy, they want certainty."

Morgan Housel

QuoteMuch of athletic success comes down to overcoming the hubris of youth while we still have enough physical youth left to make use of it.

-- Alan Couzens, Dec 31, 2023 - https://x.com/Alan_Couzens/status/1741492237828002035?s=20

"Apple's most valuable intangible asset isn't its patents or copyrights – it's an army of people who believe that using products from a $2.89 trillion multinational makes them members of an oppressed religious minority whose identity is coterminal with the interests of Apple's shareholders."
  -- Cory Doctorow
https://pluralistic.net/2024/01/12/youre-holding-it-wrong/

"Some people learn by reading, others by observation. The rest have to piss on the electric fence for themselves." -deleted (reddit)

The ability to learn from the mistakes of others is a big part of what's separated us from monkeys, but i feel like I've known several electric fence pissers over the years.

Spotted on Twitter:

"My plan... work so hard your competition gets tired just watching."

Spotted on Twitter:

"The road to fascism is lined with people telling you to stop over-reacting."

I'm going to have to remember that one.

https://x.com/Britannica/status/1796297927419195806

Britannica
@Britannica
Yes, we've already updated his bio.
4:49 PM · May 30, 2024

No context needed. :-D

"No man is so foolish as to desire war more than peace: for in peace sons bury their fathers, but in war fathers bury their sons."

Herodotus, The Persian Wars, Book I, para 87, quoting Croesus