Meaning:
The statement means that the speaker would be away for five years, and although it may be difficult to predict how his grandmother would be after five years due to her age, she has the ability to predict it accurately.

Explanation:
The statement is from the story "The Portrait of a Lady" by Khushwant Singh. The speaker, who is the narrator of the story, is talking about his grandmother. He says that he would be going away for five years and that his grandmother, who is quite old, can predict how she would be after five years.

Importance of Age:
Age is an essential factor in the statement because the speaker is referring to his grandmother's age when he says, "at her age one could never tell." Age is a significant factor in determining a person's health and well-being. The older a person gets, the more likely they are to have health problems. Therefore, predicting how someone would be after five years, especially someone who is old, can be challenging.

Grandmother's Ability:
The speaker then says that his grandmother can predict accurately how she would be after five years. It shows that his grandmother is wise and knowledgeable and has the ability to foresee her health and well-being after five years. She might have based her prediction on her current health status, family history, and lifestyle.

Conclusion:
In conclusion, the statement means that although predicting how a person would be after five years can be challenging, especially for an old person, the speaker's grandmother can predict it accurately based on her wisdom and knowledge. The statement highlights the importance of age in determining a person's health and well-being and the significance of having wise and knowledgeable elders in the family.

Actually sir ne abhi Tak Hume chapter ni karvaya .....so It's not possible for me to explain it.....sorry.