IME women often are expected to do more than male siblings. I'm of an age now where many of my friends' parents are elderly and need support. Unless there is a huge geographical reason 'why not' it's the women who are expected to be the 'carers'.
I think as I said upthread it's hard to be objective over @whitdust post. There are always 2 sides to relationships.
On MN there are as many threads encouraging women to 'have a life' once they have children, put them in nursery when they are months old, and not allow them to clip our wings YET we have adult children saying their parents did 'have a life' when they were children, and they feel hard done by. As a parent you cannot win!!!!
I don't know- we'd need a fuller picture from the OP.
Relationships are a two-way process @whitedust. You said you moved away and visited 'every few months'. Why only that much?
As I said before, it's easy to be cynical and think your parents only want you now to provide some social life for them. On the other they may think time is running out to see you all.
Your parents are still young (ish). Mine are in their 90s. Dad died weeks ago at 92. Mum got a new life in her early 70s when she joined the WI. She is now a committee member and has masses of friends.
Your parents sound as if they were very active and sociable so it's not too late for them to rekindle that surely?
But I agree that as a family you all need - your siblings- to have a pow-wow over long term support for your parents if you feel it's falling on you. I know you feel they are 'using you' but their side might be (just consider this ) that they worked hard all their lives to give you a comfortable childhood, (they must be quite well off to retire at 50) , they didn't make any demands on you before. I don't know- just suggesting another side to it.
Only you know if your parents are trying to rekindle something and build bridges or if they are using you due to boredom. All I'd say is that we all make mistakes as parents- you will be too, now with your own children- and we ought to find room in our hearts to forgive if we can.