I also want to live my life but where I grew up, small town in GA, the expectation seems to be I move in with my parents to physically take care of them, otherwise I’m not a good son.
Oh man, okay so I feel this so hard. I have felt that guilt put on my shoulders and I've seen friends and family have that guilt put on theirs. You will need to choose your own path but I'll say that you will be the only one who cares about your life path.
My friend moved to a place ~500 miles away from home and loved it, was happy to be there. His mother refused to visit. Old world "A mother shouldn't visit her son, her son should respect her and come visit". So he did. Then she guilted him into moving back home, giving up opportunities farther away. He is happy in the sense that he's married and has kids and a fulfilling life, but he will always have the what if questions. What if his now wife and him had stayed, what if they had done this or that. I promise you, if you let them drive your life you will never be truly fulfilled.
Which is what drives my question. If they need assistance in the future, why couldn't they move to where you are? Because every reason they could give could be equally flipped to you. "We have friends here". "We have a house here". "We like it here". All of those you could say about where you are too. So if you are happy where you are and they need care why couldn't they come to you?
The funny thing about people who think about things like "good son" or "good " is that you will never do enough to appease them. Ever. You will need to grapple with this. You can move home. You can give them spongebaths. You can tuck them in at night and help them go to the bathroom. You will never be a "good son" if you aren't now - because you are a good son. Just by thinking about this you are a good son. Their expectations of what a "good son" however non-commital and will always change, proven just with the guilt. The sooner you accept that their expectations of a "good son" will never be met, the sooner you can think more practically about how you want to proceed with life.
I had to go to therapy to realize how much guilt there was in my family, and learn some techniques on how to combat it. The most effective one is simply to call it out. They pull that "Well you're just so far away" or "I wish you lived closer" you just gotta call that out, right there, on the spot. That shit breeds with repression, just letting it get away. "You're just so far away" -> "You're always welcome to visit". "I wish you lived closer" -> "I wish you lived closer to me too!". Put it right back out there. I've just also done the "Mom I'm not doing the guilt trip today. Your feelings are your own, I'm happy where I live and if you have a problem with it that's your problem to work on, not mine".
So, I'm sorry for the wall of text, but that last line needs to be called out. You are a good son. There are no expectations that you must give up your life to take care of them. If they didn't plan ahead for life and expected you to come home, that's their problem, not yours. Of course help where you feel comfortable, but it should be because you want to and it fits in your life, not because they expect it.