In the past it was common to have persons in the congregation that were “ coming along “ I.e. studying and progressing to baptism, whole families even. I was thinking back to many of such ones who have gone on to be elders and main supports of their congregations.
That was a long time ago. I cannot recall the last time that happened. Now the baptisms are almost always youngsters growing up. The younger elders are all born ins. The only odd “study “ that attends have been very odd people indeed whom I suspect are there for social reasons.