I must admit I chuckled a year ago. Our grandson was in the high schools' performance of West Side Story. (Bragging: He was Officer Krupke as a sophomore!) I have the original movie video and have probably watched it more than 20 times over the past 30 years, and of course I read Romeo and Juliet twice in school.
The teens sitting in just in front of us didn't seem to be familiar with either version of the story line and they were very vocal in their reactions. One of the young ladies really got caught up in it and said, "NOnononono! They didn't!" when Tony got shot. (Hope that's not a spoiler for anyone!)
Then I realized that seeing the story through young eyes is an entirely different experience!
And yes, I still rewind the tape (I have and use my VCR with CD player) when the last scene begins sometimes. And I still cry, despite knowing what happens. (And I miss Natalie Wood and the rest of exceptionally talented cast and musicians!)
So, my point is that I don't give a darn about spoilers and often forget that others do, I guess they do matter to some, and I'm not sure there is a time or experience limit for them.
And, Yes, the boat sank.