The issue is far more complex than age discrimination, people look at the lack of examples before age 40 and the few of us in our late 30's and 40's and jump to age discrimination but the reality is there where just fewer of us back then, then the .com bust and the downturn ran a lot out to other industries and there is natural attrition.
Maybe surviving after 40. More realistically surviving after 50 is a legitimate question in my mind.
Edit: terrible word usage in last sentence