Kids can not prosper without the wisdom of elders. Yes, the children of today are the future of tomorrow...however if wise elders are not there to guide them, then it can be certain that the future will not be prosperous for them.
Senior intelligence level varies very widely, due to the wear of the brain. Some might he extremely gullible, some might be in fine condition and therefore they are able to things like innovate or support the Bitcoin community. We can't blame any senior for being scammed, we can definitely commend them for trying a new technology. Hopefully the scam success rate will reduce over the next few years.
And which of them will contribute the most?
Kids, seniors, etc. Everyone contributes equally. No one group is more popular than the other. Kids will use it for longer though.. As we can't escape the reality that seniors ... expire... lol