Joseph……In general I agree with your numbers. I would add 3 years in the Litvish and MO communities for those in Medical < Dental and Law schools…Perfectly acceptable to delay to finish a professional education.
Our 4 child finished Law School in December. She had done a year of Seminary after High School before college, add 4 years college and then law school and she was 26 when she married just before Pesach. The new son in law is Litvish. He was also 26, they met in Law School, fixed up by a professor.