Is attempting to discredit something by invoking it’s age a fallacy?

The typological model in anthropology for categorizing people by race is now thoroughly discredited is a statement of fact. But as Bo said, simply calling something outdated is not an argument. It may be the beginning of an argument, like saying "position X is outdated" and then proceeding to demonstrate with evidence why this is so. But left alone it is not an argument at all but more like an ad hominem.  It almost appears like they are saying you are outdated.  

“Anti-racist PC agendas and the American Anthropological Association's recent confirmation of the unity of the human species have led to the belief that race is a socio-political invention that promotes racism. An ironic accusation since the denial of the science behind race is what's politically motivated. Forensic anthropologist and professor of anthropology George W. Gill, whose assessments are supported by modern genetics, explains.“

http://racialreality.altervista.org/race.html

There is only one race -- the human race -- and it comes in all shapes, sizes and colours.  Yes, there are those who have a vested interest in promoting  "race" and "race difference" but their agenda is quite evident. But this is not the forum to discuss these matters. 

I'm both old AND outdated.