Is an 18 year old an adult?

Today, April 1, the age of adulthood was lowered to 18.
This is the first revision and enforcement in 145 years since the Dajokan (Grand Council of State) issued a proclamation in 1876, setting the age of adulthood at 20 years old.

With this amendment, those over 18 years of age are now free to make valid contracts of their own volition without being subject to parental authority.
Previously, men could marry at age 18 and women at age 16 (changed to 18 with this amendment), but parental consent was required; from now on, marriage can be performed without parental consent.

The Philippines, like Japan, defines 18 years of age or older as an adult, but differs from Japan in several respects.

In the Philippines, the rules for drinking and smoking are more lax, but in Japan, once a student graduates from high school, the rules are almost non-existent. In Japan, rules are almost non-existent once you graduate from high school.

The Philippines is more strict when it comes to marriage. However, in the Philippines, there are many couples who do not get married, so this law may not mean much.

Gambling is almost the same in Japan and the Philippines, and is not allowed after the age of 18.

Although legally considered an adult at the age of 18, they need to gain a little more social experience before they can become a full-fledged member of society.

It is said that the brain matures to some extent from late 20 to 30 years of age, and an 18-year-old is still immature.
Looking back on myself, I was really unstable and immature in my 20s.
Therefore, I think it would be appropriate to set the age of adulthood at around 25.

By the way, what will happen to the coming-of-age ceremony if 18 years old is made an adult?
The government seems to be asking each municipality to make its own decision.
Next year, some municipalities may hold a coming-of-age ceremony for all adults from 18 to 20 years of age.