It's really an interesting direction to look at. Because the GB runs a cult, they are stuck to their idiotic rules.
Since the 1970's in particular, this cult has grown in large part due to the amount of men appointed as elders. That isn't an accident. I doubt that the GB had that kind of forethought, but if it did, good for them.
With more work to do, KH's to build, conventions to arrange, having many elders allowed the GB through CO's to appoint who would be a good fit for them.
As noted by many here, since 1995, when the amount of elders has dwindled, the challenge for the GB is how to tackle that problem. One solution was to appoint young men in their mid 20's. As has been noted, many pros for the GB, tons of cons for the congregations who have to put up with leadership from young men who stopped picking their zits a year or two prior....
These are self inflicted wounds of the GB. There is no answer for the shrinking pool of "qualified" men to choose from, unless an amazing paradigm shift happens within the GB.
They insist on cult like behavior, and they need elders to administer the cult rules. In the information age, the younger generation has easy access to information the GB would like to keep hidden. Hell, we are living in the "Information Age." It is too late to scare off this generation now.
I am not saying that the GB sees it this way. They are hoping/praying that they can still keep people, esp young men, off the internet. Amazing to me. That is a big time losing bet.
The consequences of all this crap is the flock. Every congregation that has to put up with young elders, many of whom are pioneers and are at best married without children (or worse, single bachelors who have never even been married) dispensing life advice to families young and old are worse off. It is very evident that the wisdom lies with people in the audience, living it.
Of course, because the GB defines wise people as "those who believe our batshit crazy WT articles", it's a lose/lose situation for all. No leadership, no wisdom, just a channel available to the GB to control, manipulate, and guilt people into staying. What a miserable existence.