It doesn't really work that way. They are two standard forms of Hindustani, both with a history of use that goes back for centuries.

They're dialects of the same thing, recognised as separate languages very recently on primarily political grounds. The two are currently diverging due to changes happening in one but not the other, with the two dialect communities not having a high degree of interaction. However they share an origin, so you can't say one is older than the other, even if it were a reasonable thing to say of unrelated languages (which it's still usually not).