Across the West, the ruling elites are moving to recruit young voters, to keep up their power levels, and to prevent tragedies such as the election of the largely useless Donald Duck, sorry, Rump, sorry, Trump. The fear is that what is being farmed here are impressionable youth who are easily manipulated. Maybe, but the definition of an “adult” seems to have shifted:
  https://www.bbc.com/news/newsbeat-47622059

“People don't become fully "adult" until they're in their 30s, according to brain scientists. Currently the UK law says you become a mature adult when you reach the age of 18. Scientists who study the brain and nervous system say the age at which you become an adult is different for everyone. Research suggests people aged 18 are still going through changes in the brain which can affect behaviour and make them more likely to develop mental health disorders. Professor Peter Jones, from Cambridge University, said: "What we're really saying is that to have a definition of when you move from childhood to adulthood looks increasingly absurd. "It's a much more nuanced transition that takes place over three decades." He added: "I guess systems like the education system, the health system and the legal system make it convenient for themselves by having definitions." When you reach 18, you can vote, buy alcohol, get a mortgage and are also treated as an adult if you get in trouble with the police. Despite this, Professor Jones says he believes experienced criminal judges recognise the difference between a 19-year-old defendant and a "hardened criminal" in their late 30s. "I think the system is adapting to what's hiding in plain sight, that people don't like (the idea of) a caterpillar turning into a butterfly," he said. "There isn't a childhood and then an adulthood. People are on a pathway, they're on a trajectory."

     So, perhaps rather than lowering the voting age, what is really needed is to raise it, to produce quality control. How about making it 30 years? What would be even better would be to do what used to be done in some local council elections and reserve the vote to people with families and a house, even if rented. From there we can march forward to the past and tighten things up even more.