Take Ken Cook;
Graduates HS 1980 (I think, per his WT introduction), call him 17.
Arrives at Bethel 1982
Franz dies 1992; he's now 29 (Somewhere in those intervening 10 years he starts partaking)
2022 is only a few mos away; He's now 59.
2032; He's now 69, and staring down death. This will be time to come up with a new explanation.
Could he live to 99, i guess so- but, is that relevant