There are a whole slew of issues related to this. Managers often feel that older employees don't take them as seriously as younger people. Younger folk are less

There are a whole slew of issues related to this. Managers often feel that older employees don't take them as seriously as younger people. Younger folk are less likely to have seen it 'all' like older workers. There's also the age dynamic of an org. Some companies hire young because of the culture of 'work hard play hard' where younger folk buy-in but older folks skip it and go home to their families. Older people are more experienced and more expensive in general. Younger people are also more likely to be willing to work to burn out as they've not done it before and managers know that. My two pronged approach to getting older in the workforce is to make sure there are people older than me at my work place, and have an exit strategy for when the jobs dry up completely.