Let me tell you about a well known congregation (to me.)
In the mid 1990's when all was forward moving and building for increase it peaked at 89 publishers. Since then it has slowly but inexorably reduced to about 65. The congregation next to it on one side has been dissolved - its kingdom hall sold.
This congregation had six group study locations at its peak, now it has four. Rumour has it this will soon drop to three.
Now - one of these areas of this congregation had three groups at its peak - it was the hub of the hall with several elders and their families living there. It now has one group with the following make up ...
Out of 15 members (2 elders - no MS's)
10 are over 70 - of which 3 are housebound and over 80.
1 - late 60's disabled
2 are in their 40's to 50's (1 pioneer) and are the core of the groups ministry.
2 - couple late 20's born ins - him not reaching out - her mental issues and just coping
In the last three years - two other over 70's have died and one brother in his 60's has been DFd. Two teenage girls have left before baptism.
The downhill trend is speeding up ...