Why couldn’t they move close to you? You had a job and life settled. They are retired and therefore far more flexible in that aspect.
There might be some factors you didn’t share of course. If I was asked the same I would help but it’s my parents who would have to move. If they are not willing then clearly that help is not needed so badly to justify such a drastic change in my life.
It makes sense. Everyone situation is unique.
I’m dealing with some entitled person in my family so I have learnt to be defensive on this sort of requests. I’m prividing help but with the clear boundaries. I’m not going to sacrifice my life because someone wants to.