Kaa the python and Mowgli the man-cub

Let Kaa's present age be $x$ . Thus his age last year was $x-1$ which means Mowgli was $\frac{x-1}{4}$ years old then. Now Kaa's age the year after next would be $x+2$ which means Mowgli will be $\frac{x+2}{3}$ . Note that three years have lapsed which means that:

$\frac{x-1}{4}+3=\frac{x+2}{3}$

$3(x-1)+12(3)=4(x+2)$

$3x-3+36=4x+8$

$3x+33=4x+8$

$x=25$

So Kaa is $\boxed{25}$ years old this year.