Age is not relevant because age will not automatically make a sock puppet account become real. Tron could make a bunch of accounts and those accounts could eventually become old enough for your standards. And that means they can some day be old enough to ride, like tall enough to go on your roller coaster. What really matters is letting people vote for witnesses. But at the same time, perhaps Steem needs states and an electoral college.
RE: Reputational Enhanced Delegated Proof-of-Stake (REDPOS)