We live in Switzerland and my 4 yo DS goes to an English language preschool. His teacher is a lovely English lady and DS loves her and school generally. Wednesdays here are no-school days until you are 7 (I think) so DS is home today with me and his little brother. When my youngest was having his nap, DS asked me (out of the blue) whether he was going to die. He said his teacher had told him he would. He asked whether children die too.
I will admit to being caught totally off guard and my answer was pretty cobbled together (not religious, we're not) but I tried to reassure him that he would live a long and happy life and death is a part of life but not something he needs to worry about. He then told me that he didn't want to die as he would miss me, with wobbly mouth and eyes welling up. I chickened out from telling him about parents dying. We've been lucky enough to not have had to deal with the death talk (obviously, from the crap way I handled this) and whilst I was mentally penciling it in as something I should bring up, it was not going to be right now!
I couldn't get much out of him about the circumstances of his teacher telling him he "was going to die" but now I'm wondering whether I should ask her or is it normal for death to be brought up so young? My instinct is that this is too young but I could be being overly precious. Also, what should I say to DS about it? My youngest woke up from his nap and interrupted the conversation and DS is now playing happily. Any advise most welcome. I feel really upset actually, I feel blindsided by an important issue and I failed the test 
I will be taking the kids out soon, but thanks in advance for any replies, I will be back asap.