In AS YOU LIKE IT, Shakespeare gives us seven ages of man.
All the world's a stage,
And all the men and women merely players;
They have their exits and their entrances,
And one man in his time plays many parts,
His acts being seven ages. At first, the infant,
Mewling and puking in the nurse's arms.
Then the whining schoolboy, with his satchel
And shining morning face, creeping like snail
Unwillingly to school. And then the lover,
Sighing like furnace, with a woeful ballad
Made to his mistress' eyebrow. Then a soldier,
Full of strange oaths and bearded like the pard,
Jealous in honor, sudden and quick in quarrel,
Seeking the bubble reputation
Even in the cannon's mouth. And then the justice,
In fair round belly with good capon lined,
With eyes severe and beard of formal cut,
Full of wise saws and modern instances;
And so he plays his part. The sixth age shifts
Into the lean and slippered pantaloon,
With spectacles on nose and pouch on side;
His youthful hose, well saved, a world too wide
For his shrunk shank, and his big manly voice,
Turning again toward childish treble, pipes
And whistles in his sound. Last scene of all,
That ends this strange eventful history,
Is second childishness and mere oblivion,
Sans teeth, sans eyes, sans taste, sans everything.
I have divided my own life into three parts: longing; being; dying; and I have written that life is only forty years long in that our lives are defined by what we do from twenty to sixty give or take a few years.
Recently scientists have defined five phases of life as shown in changes of the structure of the brain with significant transitions at ages 9, 32, 66 and 83.
They are childhood, adolescence, adulthood, early aging, and late aging.
I, who am 84, smiled at the statement that there is less data about late aging because researchers had difficulty in finding sufficient healthy brains at that age.
https://www.bbc.com/news/articles/cgl6klez226o
I have no particular memories of age 9, but what I call the being of my life began at age 32. I believe that had less to do with whatever changes were taking place in my brain than that it took me that long after college to buy and prepare a boat and save enough money to make the voyage and free myself.
The transition to the third part of my life came between observed transformations. I was 77 when I completed the GANNET circumnavigation.
Now at the beginning of late aging I am aware of changes. New information that is not reinforced is often lost. Connections in my brain are sometimes not made. Words sometimes come less easily. Memory is less reliable.
All these could be signs of something more serious, but i don’t think so. My vital signs are still good. I take no prescribed medications. I use my body hard. I am writing a book. I sail.
There is a cliche, ‘Finish strong and show no weakness’. To an extant it is good advice, but it can become delusional. No one at 83 is what he or she once was and without weakness.
To life.