Yes, you may need to tell him how it turns out, skip that part, etc.

With DD, we were mostly past this at...um...9? Sorry.

DS5 is still in this phase, although it's not as bad as it was with DD. He's mre easily scared than prone to attacks of existential melancholy. However, he recently burst into sobs at the end of Amos and Boris, by William Steig. (Of course, I also find this book emotionally affecting, so.)