You're fortunate enough that you're 18.....an extra 4 years probably won't make a difference to you but to some people it can be a significant percentage of what is left of their career.
Also if you borrow the money and get into the job market earlier you will be four years further up the seniority list which might be helpful if it all hits the fan.
Still, with recession looming then maybe waiting 4 years might be a good idea right now..