42 is an even number. We all know that life is uneven. Therefore, the meaning of life cannot be 42, but can only be 41 or 43.
However, as you tend to get less out of life than what you wanted, the meaning to life cannot be 43, as this is more.
Therefore, by process of elimination, life must be 41, as this is less than what you wanted.
As a consequence, the meaning to life is not 42, but actually 41.
In summary: life is uneven, and you get less out of it than what you would have liked.