It is a period of change but nobody knows how they will change- to become more suited to one another or less so. My niece (nearly 30) is happily married to the boy she dated when she was 16 and he was 15. I am very happily married to my first boyfriend whom I met at 19, 35 years ago.
I don't think either I or my dn have had our development stopped- perhaps because the relationships we had with our respective boyfriends allowed all sorts of different other freedoms.
I didn't compromise and dh did not expect me to. During the time of our early relationship, I lived in a different country, I did a degree, and then a PhD, I travelled, both on my own and with him, I had lots of friends and a good social life. Meeting somebody when you are young doesn't have to mean you sit at home and darn his socks forever after. It is really only children that force compromise, and we both agreed to defer those until we were both ready. In our case, being from different countries (holiday romance) that meant one of us having to emigrate and feeling settled in their new country. In the event that turned out to be me, but more because I felt the UK would be better for my career than because I was a woman- dh would have been just as ready to take the plunge.
I'd say both dh and I have changed quite a bit over the years - certainly more mature than we were- but we have grown together rather than apart.
My dn and her bf did not go down the academic route, but they waited quite a while before having children so they could do the travelling they both wanted and generally enjoy a bit more freedom.