Gap between an even integer and the next smaller prime?

$122$ is even, and it is between $113$ and $127$. The difference, $122-113$, is $9$, definitely composite.

How I searched: primes greater than two are odd, so the difference between an even number and a prime is odd, so what is the smallest composite odd number? Then, the search was for a pair of neighboring primes at least nine apart.

The counterexample of Kyle Miller solve the problem, but we can say more. Since we can take prime gaps abitrarily large, we have that exists infinite even numbers such that $D$ is composite.