In the last 25 years at my hall we've had ONE ministerial servant appointed as an elder.
The MS was about 55 when this happened.
In the same time frame we had three elders die from old age and two others reduce their activity on the platform due to age.
The average age of our elder body is now in the high 60's, with no elder under 50.
We had a few elders move in from elsewhere, but that's movement, not increase.