Many of the real old timers have now passed away. I remember when I was growing up there were people in my congregation going back to WWI and we had one ex-missionary who had been to the 2nd Gilead class. These are all long gone.
The congregations today are oftem made up of 2nd, 3rd and even 4th generation witnesses.Many of today's elders are sons of elders. And, unlike the 60s and 70s I don't see any new famillies joining the religion. Where new ones do come a long as individuals and often they are the strange and disfunctional.