I think they were together in the end of the film.

Because they showed an old, old woman sleeping and showed pictures of her life, I interpret the ending that Rose died and her soul joined him in wherever those who died back there, wwere, and she bacame again the age she was on Titanic because that's where she returned in a timeless existence. :)

The end was just a dream.After that we can heart 'Every night in my dreams...' and I found on net that she died in 102.