My sister and I were talking about this recently (at a funeral in our family). We're in our 40s, and people older than us had largely been to a dozen funerals or more by their teenage years, while people younger than us often went to their first in their 20s or later (or perhaps when their own parents or grandparents died and to no others). We have not-entirely-negative memories of growing up going to funerals, because that's where we saw and caught up with extended family, so funerals are... well, not exactly easy, but they're not traumatic in their own right. For some of our slightly younger friends, though, even attending the wake and funeral in our family, they were having a harder time than we were. And almost none of our cousins brought their kids. For the author, six by 16 probably was a lot more than any of her friends, yes.
I was forbidden from going to my great-grandmother's funeral with my parents even though I was 11 and an extremely well-disciplined child. "We want you to remember her as she lived, not as she died" was the reason given at the time, but leaving me out of the event where people were remembering her as she lived didn't make sense to me.
When my grandfather died when I was 15, not only wasn't I allowed to go, but I had to stay home and watch my siblings as my parents traveled a thousand miles away for a week. We more than had the money for plane tickets. They just didn't want to bring us (youngest was 10, and also not troublesome).
For my other older relatives, they've all insisted on not having services, and I can't help but feel it's both an effect and a cause of the fact that my extended family is very disconnected and fragmentary.
It's an interesting shift. A loss, I think.