Explanation:

- Assume the ages of the boys are \( x \), \( x+2 \), and \( x+4 \).

- These ages are consecutive odd numbers.

- 5 years ago, ages were \( x-5 \), \( x-3 \), and \( x-1 \).

- Given ratio: \( (x-5) : (x-1) = 4 : 5 \).

- Equation: \( \frac{x-5}{x-1} = \frac{4}{5} \).

- Solving: \( 5(x-5) = 4(x-1) \).

- Expanding: \( 5x - 25 = 4x - 4 \).

- Simplifying: \( x = 21 \).

- Middle one now: \( x+2 = 23 \).

- Middle one two years hence: \( 23 + 2 = 25 \).

- Answer: Option 4, 25 years.