Some older workers face no barriers, but certainly what many older workers face is ageism. For example, if there's a downsizing, companies often look to let go older workers, perhaps to protect the wage-earning of younger workers with families or because the older workers are at the top of the pay scale, so that it's a better win financially.
Unfortunately, what has happened for many of our members is that they haven't retired when they wished but rather had retirement thrust upon them. Typically, they planned their financial lives to buy a house, put their children through school, and then save for retirement, and when that last piece is truncated they end up living a much less financially secure retirement than they had hoped.