I would argue that the voting age should not be lowered to 16. I think that the average 16 year old does not know enough or care enough about politics to be allowed to vote. In addition, I am not convinced that 16 is old enough to be entrusted with that responsibility.
In the United States, 16 year olds are in their first year of being allowed to drive. They are usually not allowed to drive with other teens in their cars, for example. This shows that they are not deemed to be responsible adults. They are also not allowed to sign binding contracts or to enter the military. They are not allowed to buy tobacco. Society does not see them as adults and therefore they should not be allowed to vote.
In addition, the average 16 year old knows very little about politics. People should have some idea about what is going on in the political world and about a country's government before they are allowed to vote. Most 16 year olds do not have this kind of knowledge.
For these reasons, I think that 16 year olds should not be allowed to vote.