⏺️ To get a baby? 👶Depends on what you mean by "best age".I'd tend to say the younger possible if you consider how exhausting it is to take care of someone else; being 40 for a woman (or worse, 60 for a man) when having a child will be very difficult to manage in my opinion. Imagine, your child ask you to do hiking, bike or any physical activity and you are 70, or even 50; pure pain for everyone.
For social/resource matter, I'd say that, in the West, we commit, too often in my opinion, the mistake consisting in wanting to "be ready" before having a child. I don't believe that you can ever be ready to experience parenthood; it falls on you and then you do your best. I find this excuse too easy too, for you will always find something to say that you are not ready...
⏺️ To be allowed to get your driving licence for a car? 🚗Honestly, I don't know. 18 sounds ok for me. However I disagree with what you say, @Yue_
I don't think the "young people" who drive cars like crazy in some cities own a driving license or paid for their cars. When you start to pay 2000€ for a driving licence and much more for car + gas, insurances... you strangely become much more careful. The ones who acts like retarded despite paying will not change, young or not, without learning the hard way and yet, it's not always enough.
⏺️ To vote? 📝I'm not fond of democracy and don't really believe in voting. Rather than age, I would say that it should depends on other factors that would prove citizenship/being attached to their country and being informed enough on the topic they are asked to vote about. I think although the brain still develops for quite a white (around 25years according to some), a well informed 16 years voter would worth more than a 60 years old who "believe that they heard it from..." without being able to tell us why they vote for something.