Looks more like a hybrid to me. Many people cross Endlers and Guppies, and the resulting fry may look like either or neither parent, but often are bit larger than pure strain Endlers.
If it is a pure Endler, it does not have very much colour to it. I have 'no name' Endlers, Neon Reds, and hopefully Black Bars soon, all have quite a bit more colour than this guy, even when still very young.