No. 14’s a charm – “Old School” actor Luke Wilson was the 14th sub for ailing David Letterman Wednesday on “Late Show.” ADAM BUCKMAN rates how he did:

Luke Wilson March 26

Dave-o-meter grade: 3

There’s a reason why guys like Luke are successful – one word: charisma.

Late-night novice showed easy-going charm. Delivered funny monologue – no doubt written by Dave’s staff, but Luke put it across.

Rupert Pupkin-esque hair and mustache was interesting, if inadvertent, grooming choice.