Adam,
My thoughts ...
The Golden Age is essentially the Roaring Twenties. So, the beginning would be tied to end of World War I. The resulting economic boom created new prosperity and expansionism. The catalyst was the amount of money the average person had since prosperity had reached more people than in the past. They wanted their own places to spend their money and enjoy their new found prosperity. This coincided with an explosion of interest in golf and belonging to golf clubs.
It's a hard question, so rather than avoid it, I thought I would throw this in for conversation.
It should not be a hard question and one I've been trying to introduce for many years in this "frank and open discussion" platform. Golf is capital intensive. Without sufficient disposable income among the classes which play golf AND the ability of the relative few to amass large amounts of capital to risk on building our best courses, "golden age" discussions are essentially moot or just reminiscing about long past times.
We can attempt to ignore history or re-write it, but it won't change things. I am doubtful that a third "golden age" is in front of us, but I would be delighted to be wrong.
Ian/Lou,
I suppose it depends on your perspective. I can quite understand why from a north American viewpoint that you might associate the "golden age" with the explosion in the number of new courses being built during the period of economic boom. However here in the UK it was anything but a boom time, yet there was significant numbers of new courses being developed in the UK.
All that said, to me the expression "golden age" refers to the quality and type of courses being built rather than the number. To me the term signifies a philosophy in course design that embraced strategy, risk reward, variety, beauty and nature etc. as opposed to
some of what had gone before. Of course, you need to be building courses to be able to give rein to those ideas.
In terms of when the era started I'd suggest that would be with some of the early discussions on gca in the golfing press around the turn of the century, and that encompassed the ideal hole discussions and the like as well as books such as "Concerning Golf".
As an aside, I was looking at a plan of the initial Huntercombe course and it had an awful lot of cross-bunkers. The only difference is that they were "natural" looking rather than the ramparts in some of the Victorian efforts.
Niall