Given Information:
- The boss tells 1/6 th of his life in childhood.
- The boss tells 1/12 of his life in youth.
- The boss tells 1/7 of his life in bachelorhood.
- Five years after his election, a son was born.
- The son died four years ago at half the boss's final age.

Let's solve this step-by-step:

1. Finding the Boss's Age at the Time of Son's Birth:
- Let's assume the boss's age at the time of his son's birth is 'x'.
- The son died four years ago at half the boss's final age, which means the son's age at the time of death was x/2.
- So, the son's birth would have been x - (x/2) = x/2 years ago.
- Since the son was born five years after the boss's election, we can write the equation: x/2 + 5 = x.
- Solving the equation, we get x = 10.

2. Finding the Boss's Age at Present:
- If the son's birth was x/2 years ago and the son died four years ago, then the total time that has passed since the son's birth is (x/2) + 4.
- We know that the boss's age at the time of his son's birth was x = 10.
- So, the boss's age at present would be 10 + ((x/2) + 4) = 10 + (10/2 + 4) = 10 + 9 = 19.

3. Calculating the Boss's Life in Childhood, Youth, and Bachelorhood:
- The boss tells 1/6 th of his life in childhood, which would be (1/6) * 19 = 3.16 years.
- The boss tells 1/12 of his life in youth, which would be (1/12) * 19 = 1.58 years.
- The boss tells 1/7 of his life in bachelorhood, which would be (1/7) * 19 = 2.71 years.

4. Calculating the Boss's Age:
- The boss's age is the sum of the time he spent in childhood, youth, bachelorhood, and the time that has passed since his son's birth.
- So, the boss's age would be 3.16 + 1.58 + 2.71 + 19 = 26.45 years.

The correct answer is 26.45 years.