yes, the data's available from other sources, but a prospective employer might not see that until after evaluating some other aspects of her work, and end up hiring her in a situation in which they wouldn't if they found her age immediately
for that matter, i find wikimedia's prominent display of age for people in general to be a bit too forceful. is that really such a defining characteristic of a living person that it belongs in the highlight box ?
https://www.google.com/#q=%22said+smith%2C+25%22 https://www.google.com/#q=%22said+smith%2C+26%22 https://www.google.com/#q=%22said+smith%2C+27%22 https://www.google.com/#q=%22said+smith%2C+28%22 https://www.google.com/#q=%22said+smith%2C+29%22 https://www.google.com/#q=%22said+smith%2C+30%22
Consider how well the adoption of the Occlusion Method would work -- or rather, be received -- if applied to any other common adjective to discrimination. (Gender, (lack of) religion, race, redheadedness, etc)
To be clear, I don't think trying to keep your age a secret is an effective way to either a) keep your age a secret, or b) decrease the prevalence of age discrimination.
> for that matter, i find wikimedia's prominent display of age for people in general to be a bit too forceful. is that really such a defining characteristic of a living person that it belongs in the highlight box ?
Who knows. It's two characters, though, that are easily skimmed over when reading, and presumably enough people find the information useful to warrant its presence.