The points for age thing is supposed to compensate for the fact that a younger person, just out of college, is likely to have had less time to build up their salary, though as Springhaze states, you'll see older people hitting only 75 points but quite a few younger people scoring over 100 - not that it makes any difference once you hit 75 of course.
These changes are going to be a further blow to your young American people looking to go through a trial period of living together "normally" - that is to say both going out to work rather than having to see how things go just as visitors - with their UK partner. First BUNAC, then no YMS, now this.