An interesting way to look at it, but no. In any professional career (Law, Medicine, Accounting, Engineering, Etc.) the field is constantly evolving and changing. To stay current you have to go to conferences, read papers, experiment. You need a 'learning lifestyle' which, for folks who are passionate about what they do, is natural. An Electrical Engineer who stopped learning after they left school in 1990 is not a desirable hire, just like a lawyer who hasn't bothered to keep abreast of the changes in the law for 20 years.
What I'm saying is that if you're a professional and you're not keeping current, then your lack of currency, more than your age, will hinder your employment.
That being said, there are age biases out there. Young managers can be intimidated by hiring an older person, especially if they are insecure. And like the antecendent of this post older people who have 'been around' can sometimes see the reality of things which are uncomfortable for others to admit are true.