Since I've hit the half-century mark, I found this a little disturbing....some researchers having completed a study to measure discrimination when it comes to age, and it seems people are biased against OLD GUYS.

DigitalVision

According to this study people that were a part of this didn't seem to it it very much when a guy who is 75-year-old man really lets his opinions be shared with others.  

On the other end of the scale the people part of the study didn't seem to mind at all if a 25 year old or a 45 year old acted like someone who knew it all.  Just didn't like the old guy.   I usually like to hear older people's opinions--they been there and have lost the t-shirt! (New York Times)