We don’t what? Do you see many people who say that 6 year old kids should vote? Do you see many people who advocate that driving should be banned until 40? Do you think that credit card restrictions undermine the concept of the age of majority? No. We can put an arbitrary delimiter at first and argue about specifics later.

> Do you see many people who say that 6 year old kids should vote?

There are indeed disagreements on the appropriate voting age.

https://www.washingtonpost.com/local/takoma-park-grants-16-y...

https://lieu.house.gov/media-center/in-the-news/125-democrat...

> We can put an arbitrary delimiter at first and argue about specifics later.

We're in specifics territory, though.

> There are indeed disagreements on the appropriate voting age.

Sure, but my question was about 6 year olds, not 16 year olds.

> We're in specifics territory, though.

Exactly. The first thing to do is to make sure that 6 year olds don’t kill anyone driving recklessly and 30 year olds can vote. The rest is specifics we can argue about. The same thing with the social responsibility of companies.