Spoilers never really die. I had to explain to a coworker Rosebud, and my Mother avoided the twist to psycho for nearly 50 years (she was surprised I knew it without seeing the movie).
That said, after a year or so, just about anything should be fair game in open conversation. If you're worried about spoilers, get to it sooner. We can try and by considerate if you try and stop us, but people do need to understand that we can't not talk about hings (especially online) until everyone that is sure they're interested has had their spoiler free run.
And of course, there is a reset button. Game of Thrones and Walking Dead are based off material several years old, but the TV shows are some people's first exposure, so as much as we want to get into adaptation over what can be old material, it's polite to be quiet.
That said, after a year or so, just about anything should be fair game in open conversation. If you're worried about spoilers, get to it sooner. We can try and by considerate if you try and stop us, but people do need to understand that we can't not talk about hings (especially online) until everyone that is sure they're interested has had their spoiler free run.
And of course, there is a reset button. Game of Thrones and Walking Dead are based off material several years old, but the TV shows are some people's first exposure, so as much as we want to get into adaptation over what can be old material, it's polite to be quiet.