The ‘golden age’ is probably a misnomer. IMO, many people have been near obsessed with poo for several hundred years, at least.
Partly, it makes sense. If someone doesn't poo regularly, tend to feel sluggish and ‘out of sorts’ and may suddenly have to poo at an inopportune and embarrassing time… especially a hundred yeas or so ago when toilets were not ubiquitous. Also, although rarely mentioned, staining to pass large, hard poo is tough on your passage and often leads to ano-rectal problems later in life.
Given these factors, moms were probably encouraged by their moms to be sure their kids pood regularly. And a poo every morning, before school or something, did this reliably. Some moms opted for a dose of Castoria or ExLax at bedtime if the morning poo didn't happen. Other moms took a different approach by either noticing how long a kid was in the bathroom (at least in preteens) or listening for sounds of staining.
And, let's face it, if someone has difficulty or can't poo, an enema is a good choice to bring prompt relief. While the preparation takes longer than a dose of laxative or a suppository, relief happens within minutes. Also, if it's a bag of warm water, not a Fleet,, the poo comes out propelled and accompanied by a gush of water which eases the passage of even large, had lumps.
I suspect that the ‘golden age’ is more a matter of perception than reality. In those days enema equipment was designed to give yeas of service as those attributes were prevalent at the time. Today, it's a disposable society and so are the enemas and douches.