I wonder if other people have noticed, in their family or old
congregations, that older JWs tended to come into the religion when they
moved to a new location?
My take, I think that many people move for a fresh start and too look for new beginnings. They are in a place where they have hope that new (and good) things will start coming their way. So I can see how they may be more welcoming of some stranger visiting and offering them something that resembles their new hopes for their new lives.
I think it will be interesting if there was some kind of study to quantify the number of people who join based on the factors that compels them to become part of that organization.
@Crazygyu, what I have heard is that there are different reasons for people to join, some are things that range from being in a vulnerable time in their lives when they have lost something or somebody, or the JW message speaks to them because they are very disappointed with the state of their lives or life in general or the world, or maybe they think that joining them will help them find a suitable decent mate.
If you look at the makeup of the JWs, and ex-JWs we come from all walks of life, so though there are more vulnerable populations in society, there are other things that appeal to many different people in many different ways.