You're not really engaging with OP's point. "an impressionable and easily influenced demographic" describes every demographic. 16 year olds are not particularly

You're not really engaging with OP's point. "an impressionable and easily influenced demographic" describes every demographic. 16 year olds are not particularly unique in that regard. 16 year olds could absolutely flip to the far right in the future, who knows! But they have more of a stake in the future. Allowing them to vote redresses a small amount of balance against voters who do not have a stake in the future.