Doesn't seem to be a problem in my mom's congregation. Those folks are breeding like rabbits.
I do wonder, though, about two couples in her cong who are no longer young. Each couple has been married for 40+ years (I'm 46 and don't remember a time before they were married), and neither couple has children. Of course I don't know why they didn't have kids, and it's none of my business, and I realize that not everyone wants to have kids, JW or not. But I wonder if they decided, decades ago, not to have kids because "the end" was near. And if so, I wonder how they feel about that choice now, when other couples their age are enjoying their grandchildren.