I favour a staggered age of sexual consent (teens being charged for having sex with someone a year or two younger than them is ridiculous).
Driving I think there's a good argument for raising the age for safety, however, I also understand it being 17 so that people can feasibly be driving by the time they're 18 when they might need to for employment.
Alcohol tbh is fine at 18. Most people start a little younger but that's half the fun
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Doctors without parents, I think a child of any age should be able to ask to speak privately, for various reasons. Doctor's discretion about whether or not to disclose medical details to a parent.
Voting I agree should be 16, with mandatory, unbiased classes at school on the lead up to votes. It's the perfect time to politically engage people before they're lost to it forever.