There is something in that, but I would argue that there is also an increasing knowledge of the downsides of dependance. After all, the aged may indeed expect in some cases to depend on the social safety net.
Most people, when they are young, more or less expect that parents will take care of them - and resent it somewhat when they do not.
As they transition into independence, they conciously or not hope for that role to continue - if not filled by their parents, then by the state.
However, once true independence has been achieved, they very often realize the true value of having achieved it at least in part through their own efforts. This is something that only experience can provide. Anyone can understand the urge to feed the hungry and house the homeless, but the ongoing value of feeding and housing yourself is something that only doing can really demonstrate - after all, all the resources necessary to feed and house other must ultimately derive from the surplus of those doing so for themselves.
Moreover, by that time, a person will likely have known personally some examples both of those truly in need, and those simply unwilling to strive.
This does not lead necessarily to dislike socialism, but rather to appreciate its cost - security at the price of a hefty tax on the productive, and dis-incentives to being productive in those so inclined. Also, by that age, most people will have experienced the inefficiencies and corruptions that any form of wealth redistribution leads to.
Which again is not to say that they will oppose socialist measures - the good may in many cases outweigh these factors. Just that they will likely be more wary of them.
As for social conservatism - I do think that most people’s attitudes are formed early and often do not change radically. If society as a whole is growing more socially liberal over time, older folk will appear more socially conservative - but the reverse could also be true.