I have old farts, hermetically sealed in Mason jars.
I have spent a lot of my youth musing over how the capture of a fart could be most effectively done. I came to the conclusion that water displacement in the bath would be a 100% method with no loss or leakage. While holding a jar upside down and full of water you would have to 'catch' the fart bubbles as they rose up the bathwater.
Leading to the question - do all the bubbles rise in the same place for ease of 'catch', or would you have to move the jar around significantly in order to net a healthy amount of gas?
Also, having executed the 'catch' would you be able to ignite a small flare by simultaneously puncturing a small hole in the lid and holding a flame nearby?
Back to the real question. I think undoubtedly the ratio of old JW farts compared to old apostate farts is high, due to an increasing amount of young farts leaving the former and joining the latter, hence effectively doubling the effect of young fart loss in the JWs.