The ending didn't just end with them at that point in time...it kinda showed them over the next 4-6 years of their lives...
Julie got pregnant by Ryan's dad...they had a baby boy together. She went back to college and got a degree. Unsure if they married or not.
Sandy and Kirsten's home was destroyed in an earth quake, they bought their old house in Berkley...they had a baby girl. Sandy now teaches law at Berkley. (sp?)
Summer and Seth ended up married after they took a "break" from each other for a bit...Seth going to school and Summer joining some activist group named GEORGE. (??)
Ryan ended up becoming an architect, unsure of his status with Taylor...at the end, he noticed a boy looking very much how he did when he first met Sandy Cohen...he asked the boy if he needed "help"...and that's how it ended.
As OTT as ever but nice to know so I can rest in peace in the grave. Thank you very much for your time!