The age of consent is the age at which the law says a person can agree to sexual activity. If you are 16 years old and above, you can legally have sex (or do another sexual activity) with another person who is 16 years or older as long as you both agree to it.

Can an 18 year old date a 16 year old Aus?

The law criminalises people who have sex with under-16-year-olds. So, if an 18-year-old is having consensual sex with a 15-year-old, the 18-year-old is guilty of an offence and the 15-year-old is the victim. The law gets confusing (and unworkable) where both partners are under 16.