In the vairagya-prakarana of Yoga Vasishta, Lord Rama has already negated the glorification of childhood, shown how dangerous is the youth, and also exposed the trap which is sexuality, sexual urges.

Now the Lord proceeds into the characteristics of old age, in sarga 22.

When the youth came it swallowed, it finished the childhood.
When old age came it swallowed, it finished the youth.
Old age destroys the body, in every respect.

If you think that old is all about enjoying with your grandchildren, your son and daughter-in-law taking care of you; no, your body itself will not allow you any pleasure.

What does the body look like in old age?
Don't old people look like camels?

Wisdom runs away when the body is weak, ridden with diseases; all the wisdom that you used to give away to others, all the philosophy, all the proverbs, they all run away when your own body becomes old and weak.

People may be behaving politely out of compulsion.
But mostly everyone mocks at an old man behind his back.

Even your basic needs will start looking unreasonable to them.
See, he is eighty; still, he will not accommodate if salt is a little less in the dish.

Have you seen what kind of trees vultures sit upon?
Old, dry.
In the same way, in the old weak body, disease-ridden body, desires come.
The vulture-like desires come to the body which looks like an old dry leafless tree.
Desires that can never be fulfilled.
They come only to torment the old man, torture the old man.

Fear, what after I die?
What is going to happen after I die?
Where am I going to go?
How will it be there?
This fear starts gripping.
Nothing can be done about it.

Loss of self-respect, self-confidence.
Feeling inferior.
I have lost my command.
I have become dependent.
Nobody listens to me anymore.
Nobody wants my advice anymore.
Nobody cares about my opinion anymore.
Better keep my mouth shut.
At least that will keep me away from their aggression.
I have become useless.

Not just this.
For some, an entire lifetime's earnings have been spent on the education of children.
Even the house mortgaged for an education loan.
Now it's gone.
No savings, no earning.
No place to stay.
Completely dependent on the mercy of children.

This feeling is what the Lord talks about here.
The worries are not just about earning, saving, spending, most basic things.

Will she give me proper food?
It is time for lunch.
Will she give me enough quantity?
I won't be able to complain.

Then she will tell my son when he comes back from the office.
They will start fighting.
Finally, the blame will come on me.
That I ill-treated the daughter-in-law.
I am too demanding.
Have to keep quiet.

Even where tasty food is available, the old man longs for it, but his digestive power is gone.
Eating as much as he wants will land him at the hospital.

Expecting death any time.
Anticipating death any time.

Slight breathlessness, I am going to die.
Slight discomfort in the chest, I am going to die.
Before going to sleep, what if I die in sleep?

Worrying, worrying, worrying.
Obsessed with death.

A city deserted can still look somewhat good.
A tree that has shed its leaves can still look somewhat beautiful.
A land without rains, a parched land can still look somewhat bright, but never an old man's body.

A vulture eagerly catches hold of a piece of meat only to eat it.
A girl goes near a flower and stretches her hand towards it, only to pluck it.
There are no two ways about these.

In the same way, Old age takes hold of the body only to consume it.
Not to keep in healthy and comfortable.