Witness, from what i'm seeing, concerning this generation, group and generation mean the same thing. They define this with their illustration of F.W. Franz he was born in 1893, any anointed person born in 1935 or as late as 1991 is of a different generation , according to them their lives overlap making these two groups,two separate generations,with Franz being part of the first group. These are two separate generations. The Governing Body now says they are one generation.
I know it's all bunk, because it's not supported by any scripture that i can see, i'm still waiting on the scripture that supports this