Yeah, we more or less have that in the US, too. (The details matter for specific cases, but not for general discussions.)
Yet, we still have people posting job offers like this, which demands you have gotten your PhD in the past two years.
http://parezcoydigo.wordpress.com/2012/09/10/old-phds-need-n...
I have a lot of appreciation for "you shouldn't ever lie on your resume," but I also feel for the people who feel they are being discriminated against. If someone black thought that he stood a better chance of being hired by pretending to be white (we used to call this "passing"), who am I to tell him that he should sacrifice his employment for the greater good?
If you want people to not lie about age, take away the incentive to do so.
But, if you're researching, it's trivial. You send out a bunch of CVs / resumés that are identical apart from age. You then compare the return rates.
If it's incredibly trivial to prove, I'd be surprised if it hadn't. (I'd be equally surprised if it had been attempted and shown no age discrimination--it'd push against my priors, but I'd try to keep an open mind.)
In reality, I suspect it's much harder than you suggest to prove, and even harder to litigate on.
Most companies would rather bet on a young 6 than an old 8, because they overestimate their ability to mold the 6 into a 9 (which is actually very hard to do).
That's why establishing age discrimination is impossible. You'd have to generate identically indicative/"qualified" resumes at very different ages, which is probably impossible to do.
No. Not only is it lying, which is obviously not acceptable, but it is pandering to discriminatory attitudes.
It is not legal to discriminate based on age when employing people in the UK, and thus it should be pointless to lie about age.