Monica, What you say about pensioners is quite interesting. As far as I can tell, the pensioner vote has always been split almost evenly been Conservative and Labour. However, research by *Ford and Goodwin has shown that the pensioner vote is going to UKIP. Younger voters are tending to vote for other parties (not Conservative) and in Scotland are voting for SNP. I think it's a numbers game and it is true that older people are more likely to vote than younger ones. I think both main parties have tried to keep pensioners onside, particularly Conservatives, who know that they're not so likely to pick up 'younger' voters. (Hope that makes sense.)
I actually do think that working age people, especially younger ones, have a case when they complain about the imbalance of benefits payments and the fact that wealth is increasingly owned by older people. However, I suspect the spin we're getting now is to exploit that resentment and 'prepare' pensioners for some cuts. It's been obvious for some time that working age benefits can't be cut any more without producing beggars on the streets. There is no alternative if the government insists on sticking to austerity plans.
*Sorry to quote a source, but I think it's important in a serious discussion.