In one year, the people involved are basically the same. In 50 years, a lot of births, deaths, and immigration have changed the population dramatically.

There could be a discussion about one year vs ten years or something, I don’t know. But it’s irrelevant to the current topic.

Just do what’s right based on individual circumstances. If person A is poor, help them, don’t discriminate against person B. That just feels like a government trying to pass blame for its own failed social policies over the last 50 years.

Well clearly you have all the answers lol. Again your logic is faulty. There is no world government compelling action thus by your own logic any government can simply fail to take action until the duration you have mentioned has passed and then they are absolved of responsibility.

Just like in "statute of limitations"?

Irrelevant. The question isn’t about legality. It’s morality and one of ethics. Even if it were legal it’s the government itself that would need to be compelled. There’s no higher force. There’s the citizenry which takes us to the current discussion and thread.

It’s not about being “absolved”, it’s about literally different sets of people on both sides.

If you can find the individuals and draw a straight line, then you have a case. If not, well, not fair, but welcome to reality.