Interesting post to scroll through, particularly in the light of a past-life academic incarnation. Took a Masters in Communication Psych., which is the study...in a nutshell, of how cogntion is effected by communication, and communication by cognition. Principally, it's an amalgamation of cognitive psychology and speech communication, particularly as related to issues of persuasion. A large chunk of the research conducted by the academic community in this sub-discipline has been about what influences perception, thereby driving behavior. Lotsa stuff about courtroom juries.
One of the commonly conducted experiments that specifically addresses how people evaluate and decide about others based on Age, Attractiveness and apparent SES, is to have actors memorize a play, in which they are the judger, lawyers, witnesses, etc. The "ignorant masses" who are the subjects of the experiment are the jury members. One hearing will have the actor playing the defendant dressed down, presenting poorly. The next hearing, to a new set of jurors, will have the defendant dressed attractively, and presenting more "attentively".
In run after run, juries are substantially more likely to find favorably for attractive defendants, even when the evidence presented and testimony given is exactly the same as for the homely defendant.
Another interesting one...pictures are shown to newborns, who are monitored to determine how long they gaze at a picture. Attractive faces get significantly longer looks, even though the infant hasn't had the time to be enculturated to what society may try to teach is "attractive". (i.e., the heroin-chic model, etc).
The collective conclusion drawn form this sort of research is that we can't not be influenced by unspoken, biological cues relating to the looks of a person.
Social status definition? Yes, there is always room for people to fake it up or down, but generally, again, people presenting as well put together are percieved by research subjects as more capable, confident, etc., then people not percieved as coming from higher SES. (i.e., researcher shows a person multiple pictures, some of people in Mercedes's w/ Rolex watches, some of toothless hicks, and then asks questions like, "On a scale of 1-10, how capable is this person of dealing with challenges they face in life?").
Don't shoot the messenger; I'm just recounting some of the existing research on the effects of age, looks, and apparent social status on evaluations.
It may not be right, but certainly by being aware of the existence of bias, we may be better positioned to regulate it's effects in our own activities and decisions...to promote, or not to promote.
Dr. Dave