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DD....No, I can't see that there much of connection between the two at all.
For instance, it will still be the case that people can't drive cars until they are 17, after any law change to voting.
It will be still the case that people can't buy drinks in a Pub until the age of 18, after any change to voting.
No one is suggesting that the age of 16 should be the default age for everything in life.
If you agree that piercings are horrible, and you appear to do exactly that, then you should be welcoming this law change, like everybody else and not carping.