But I have seen this situation happen so many times that is just plain wrong now.
You are 18 years old and legally you can do whatever you like.
It is best for an 18 year old to date only those known and proven to be over the age of 18.
(you better answer yes) She doesn't need a 25 year old BOYfriend right now. Leave her be and let her start worrying about her future.(you SHOULD have the mentality and maturity now,at your age, to know better)When she turns 28,,,you'll be 35. Or are you just living your life, maybe going to parties, and you met someone you "connect" with and she happens to be 18? In practical terms, not much difference between 23 and 25, but generally, there's a HUGE difference between 16 and 18.
If the 18 year old has a criminal record, or is a sex offender, or is a teacher or coach or in another position of trust or authority, it will not be legal for the 18 year old to date the 16 year old.
Also, it is not legal for the 18 year old to have sex with the 16 year old.
It is also illegal for the 18 year old to purchase or share cigarettes or alcohol with the 16 year old.
It is also illegal for the 18 year old to bring the 16 year old to an R-rated or NC-17 movie.
The 18 yo could be a highschool senior concerned with prom and their parent's rules.