Why the older generation are not job hopping as you said is that there was hardly an inflation then and there economy was perfect, everything was mostly working in accordance to the desire of people so this gives a kind of living fulfilment were as anything they got from there salary is sufficient for all the things they would need  but this is contrary to the new generation because everything from old has changed and taking different dimensions so people could no longer follow that part so they have to look for a balance so that economical imbalance will not have an effect on them being the inflation that is why high paying jobs is what everyone tend to look for.