Give the example to how to compute the life expectancy. And give the complete solution.

To compute life expectancy, you will need the following information:

1. Age: The current age of the individual for whom you are calculating life expectancy.
2. Gender: The person's gender as it affects lifespan.
3. Country: The country the person resides in, as life expectancy varies across nations.

Example:

Let's say you want to calculate the life expectancy of a 40-year-old male living in the United States.

Solution:

1. Age: Given as 40 years.
2. Gender: Male.
3. Country: United States.

To calculate life expectancy, you can follow these steps:

Step 1: Determine initial life expectancy.
Research the average life expectancy for the given criteria. For example, the current average life expectancy for males in the United States is approximately 76 years. This value will vary over time and will differ based on region and other factors.

Step 2: Adjust for current age.
Subtract the current age from the initial life expectancy. In this case, 76 - 40 = 36.

Step 3: Apply other relevant factors.
Consider additional factors that can affect life expectancy, such as lifestyle choices (e.g., smoking, exercise), genetic predispositions, and overall health. Let's assume the person has a relatively healthy lifestyle with no known genetic conditions. We will not make any adjustments for this scenario.

Step 4: Calculate the final life expectancy.
Add the adjusted years to the current age. In this case, 40 + 36 = 76.

The final life expectancy for a 40-year-old male living in the United States would be approximately 76 years.