In 2019, 56.2% of people aged 16-24 in America were employed. 50.4% were employed in the United Kingdom. 57.5% were employed in Canada. Adult responsibilities are entrusted upon this age group, so it's odd that 16 and 17-year olds do not have the privilege of voting.
Voting is a huge responsibility. Likewise, so are many duties entrusted upon sixteen-year-olds. They can drive, work, and volunteer. They can contribute financially to their household. It seems like the right to vote should come with that, as many are already highly active members of society. The argument that all rights should be given at one age is a common voice across many countries. The right to drive is a starting point, why not use that as the legal age for most things, particularly voting? It makes no sense to scatter these rights around like checkpoints.
Just because a teen is entrusted with adult-like responsibilities does not mean they are ready to vote. Not all teens are employed or responsible, and mixing irresponsible teenagers in with the responsible could be more detrimental to the voting system than beneficial. It's not worth the risk.
[P1] Young teens are already entrusted with many adult responsibilities. [P2] Voting is an adult responsibility.
Rejecting the premises
[Rejecting P1] 16-year-olds are not entrusted with ALL responsibilities. [Rejecting P2] Voting is an adult responsibility and should be left to adults.