You will get differing opinions on this. However, the way I look at it, I often pitch on a cake from a month long primary, and how is a starter any different? I have had starters over a week old that I pitched with no problem at all, so I say go for it.
On Deck: CaliCommon, Amber, Wit
Primary: Munich/Cascade SMaSH, Dubbel
Secondary: Petite Orange
Bottled: Blé de Minuit, Belgian Stout, Fuller's London Pride, Tripel Wit, Red, APA, Dubbel, Oatmeal Stout, RIS, Wee Heavy
Kegged: APA, Doppelbock, Spiced Cider, C3IPA
"Beer... Now there's a temporary solution!"