How old does a game need to be to warrant a remake?

[Leynos]

Xenoblade got a remake 10 years after but the hardware difference was huge. NES Super Mario games were remade on SNES and while they looked nicer did not improve them in any real way. I don't think a length really determines it but if new hardware offers enough power to make a real difference. Conker Live and Reloaded was a 4-year difference but Xbox made huge improvements visually. PS4 and PS3 are not a big enough gap for Dead Space in particular to make a real difference. PS5/XSX with RT can offer all kinds of lighting features in a horror game.