Student or Learner
Hi, is the noun "adults" used correctly in the following examples?
"We are both adults."
"We are all adults."
"When do children become adults?"
"When we are 18 years old, we can be considered adults".
Yes, except perhaps the last one. In many places, adulthood starts at age 21.
Most dictionaries define 'adult' as "fully grown and developed". The human brain is not fully developed until around age 25. But I would accept 18 for most purposes. The grammar's correct.
At 18 you can sign contracts. Can't drink or buy a handgun, though. Of course, it's hard to rent a car if you're under 25.
In Aus, at 18, you can drive (on an open licence), vote, be sent to war, drink alcohol in a pub. You can consent to sex at 16. Not much happens at 21, except for a special birthday party. So even English-speaking countries have different ages for adulthood depending on the right, privilege or obligation.