Of course I am.

Glowing old means the weakness of health and the retirement from the work causing lack of money and being lonly though not always.

After children grow and live their life by themselves and we retire from work, we come to face how to live in the old ages 

Somebody said like this, in old ages there are three important things.

first, health

second, money

third, lonliness

Even though three thing I mentioned above are prepared, we should have more courage to handle them.

Esfecially,  positive and active attitude to life with open mind is very important to us in old ages. 

* Correction:     Student's sentence        Corrected sentence        Grammar explanation       Better sentence   

Of course I am

Of course, I am.

There should be a comma after the word of course. 

Glowing old means the weakness of health and the retirement from the work causing lack of money and being lonly though not always.

Growing old means the weakness of health and retirement from work causing a lack of money and being lonely though not always.

Misused word, Instead of glowing it should be Growing. Should erase the word "the".  Lonly, it Is misspelled. It should be Lonely. 

No correction

Somebody said like this, in old ages there are three important things.

Somebody said this, in old age, there are three important things.

"Like" in this sentence is not necessary.  There should be a comma after the word age. Use a comma after an introductory clause or phrase.

first, health

First, is health. 

"F" in the word First should be in capital letter  because it is the beginning of the sentence.  Put  period (.) at the end of the sentence. 

second, money

Second, is money. 

"S" in the word second should be in capital letter  because it is the beginning of the sentence.  Put  period (.) at the end of the sentence. 

third, lonliness

Third, loneliness.

"T" in the word Third should be in capital letter  because it is the beginning of the sentence.  Lonliness is misspelled. Put  period (.) at the end of the sentence. 

Even though three thing I mentioned above are prepared, we should have more courage to handle  them.

Even though the three things I mentioned above are prepared, we should have more courage to handle them.
Add "the" Before three and add thing "s" With the word things.

Esfecially,  positive and active attitude to life with open mind is very important to us in old ages. 

Especially, a positive and active attitude to life with an open mind is very important to us in old age. 

"Esfecially" is misspelled. Put "a" before the word positive.  Add "an" before the word open.