Curtain Rod,
It is NOT legal in many developed nations to contractually force someone to work at lesser pay or conditions as a precondition in order to continue to work past a certain age so long as legally and medically qualified to do so. The law is quite clear. You can't sign it away any more than if it was discovered you have black ancestors you have to agree to work at a lower pay scale. And in this case, as well as in other nations, applies to any individual stationed within that nation, regardless of where there employer is based. In some cases simply doing business with assets that touch the soil of the nation brings the law into play. Doesn't matter where the contract is signed.