There are really couple of strong harassing stereotypes that we could encounter with at work. Age is one of them. Second is gender probably. Unfortunately but people manipulate with those two features as they like. There is not necessary to be young, mature or old to be abused or boycotted. I have severely challenged twice in my career with people who were actually elder than me although lower rank (on of them) and same rank (another one). Both of them (in different locations and companies) appealed to their maturity and "n-years of experience" when no other pleas remained. What is really interesting in those two cases that difference in age was not so significant as for me. Just about 10 years. Although their ego were pinched so much that it was developed in major hassle. (By the way, my relationships with other mature and worthy people 15-20 years elder than me were very good). All depends on human himself. If no age people will find some other distinguishes to abuse. Better not to be bothered so much about this. Have a good day.