This might be slightly off-topic, and I know that this is a blessing to be counted, but I do think of it as a slightly unusual childhood experience, which left me in blissful ignorance: as a child and teenager, I didn't see any adults I knew starting or finishing a relationship. My parents (both aged thirty when I was born) were happily married throughout, and so were all their friends, almost without exception, as was everyone in my extended family. This gave me the idea that marriage was something that "just happened". Having never observed it, as a teenager I couldn't begin to imagine that there was a whole process leading up to it: fancying someone, falling in love, dating, living together, marriage. I also never attended a wedding before being an adult. As a result, relationships and all their nuances were a complete mystery to me as a teenager, and I saw no reason to aspire to them; I just didn't get the whole boyfriend/girlfriend thing, which all my peers were mad about, and I thought "there's an awful lot fuss in literature about falling in love". It just didn't occur to me that that was the reality that might eventually lead to marriage.
I only realised much later that I was probably in the minority with this: many children observe members of their family falling in and out of love, and friends of their family, and many children see their own parents marrying (either each other, or somebody else).