Exactly.
I also don't think I agree that voting is some big responsibility which 16 year olds aren't ready for.
When adults vote for Mr Bucket Head or the Monster Raving Loony Party, we smile and call it part of the great democratic process. When adults vote for Brexit and then say on TV the next morning, "I don't actually want to leave the EU, I never actually thought leave would win, I just wanted to stick two fingers up at David Cameron!" or "I voted leave but I'm not really sure what the EU is, to be honest", or "I voted leave because my mate Steve said it was a good idea", we sigh and complain that people who couldn't be bothered to inform themselves properly exercised their vote in a stupid way, but we don't talk about taking their right to vote away until they've demonstrated that they will use it wisely.
If 16 and 17 year olds had been given the right to vote in the EU referendum (which many people said at the time should happen), who knows, we might not have left the EU. Those 16 and 17 year olds might have actually stopped the 50+ year olds from making a stupid, irreversible decision on behalf of the whole country.
At an individual level, your vote has little to no impact, especially in a general election under a first past the post system, as opposed to a referendum where every vote counts. An individual is very unlikely to do any measurable damage with their vote. They cannot kill or injure anyone with their vote. Most of the time, the consequences of your vote are not permanent.
Driving is a huge responsibility and yet we let 17 year olds get behind the wheel and drive completely unsupervised despite the fact that we know they have a high accident rate. This is because when they are 18 many of them will go out into the world of work and they will need to be able to actually get to work. The age is set at 17 due to the impact on 17-18 year olds who don't live in major urban areas of not being able to get to work easily on public transport. It's not because we actually believe that 17 year olds are mature enough to get behind the wheel of a car and drive it safely.
Having sex is a big responsibility which carries the risk of STDs, injuries and pregnancy. 16 year olds are generally not emotionally mature enough to be doing it but the age of consent takes into account the fact that we cannot actually stop teenagers from having sex, so we set it at a level which only criminalises the kind of sexual relationships which really should not be allowed in a civilised society, and allows teenagers to seek sexual healthcare more easily. I believe it is also designed to ensure that all teenagers are in education at the time they reach the age of consent and can receive timely and relevant sex education. Surely the same principle can be applied to voting.