I think the common goal is fuck Brexit, at least in the UK. When will these old people die already/get out of politics and let us decide our own future? So we can mop up the mess they imposed upon us?
I think the difference this time is that the older generation is significantly larger than ever before. Also, IIRC, this generation will be the first to do worse financially than their parents generation.
So taking the parents point - after enjoying a good standard of living and taking on a huge amount of debt they couldn't afford, contributing to the great recession, the older generations have now decided that the solution is Brexit/populism. Both these things will have lasting consequences for younger generations but not for the older generations looking for a quick fix as they won't be around long enough to suffer the long term consequences.
I'm not saying whether this is right or wrong but based on my conversations this is the general thought process and why it is a little different than the general 'the last generation sucked' feeling.
Not only that, they just voted us out of the common market, if the old people get their way, I'll have to get a bloody visa to go to on holiday to France or some nonsense. At least it kinda looks like Brexit isn't going to happen and the EU will collapse before we leave, so who knows... This all just looks like a world war is on its way.
I am not from UK but at least in my country young people do not vote. They can easily change election outcome without killing old people but they do not bother.