Not only that but I was reading an interview with Roberta from 1997 or 1998 and she hinted at the possibility of Rosella perhaps marrying Conner...
Roberta's comment wasn't "marrying" connor it was "meeting connor", it was in reply to the interviewer who was wondering if Rosella would marry connor, or if she was with Edgar.
Perhaps in some future King's Quest game, Connor will at least meet Rosella!
-Robert Williams
That really didn't apply to "when", she could have easily been married to Edgar already. Also note that the interview was made before the game was even released.
Graham was about 44 years old in KQ6-7(he was 19 at the start of KQ1), according to the official timeline. Both KQ6 and KQ7 occured during the same year in the official timeline. So if at least a decade had passed between KQ7 and MOE, graham would be about 54.
BTW I'd have to do the math again but there is about a 2 year difference from that of TSL's version of the timeline, he's 42 or so during KQ6, 43 or so at the time of KQ7 and MOE. KQ7 and MoE are placed during the same year, only a month apart. They have events of TSL taking place about one year later, so that makes Graham about 44 in their timeline during TSL. If we assume his age was 19 during start of KQ1 in their timeline.
BTW, the TSL timeline doesn't entirely match up with the official timeline anyways, as they didn't always follow when the manuals, or official guides said each game took place.
Plus they have events of each game usually taking place over an entire month or more(KQ1 for example takes place over the course of 6 months in their timeline), where as in official timelines the events of most of the games usually only took a day or two at the most(KQ1 for example only took place over 2-3 days). So the years don't always match up. They are largely inconsequential differences, and do not affect the stories themselves, but they do make the timelines different from each other.
In TSL's timeline he doesn't appear much older than he appeared in KQ6, he looks largely the same, its not like there would be much of a change in 2 years in which POS placed the events in their timeline. Compared to how he looks in MOE, Graham looks like a spring chicken in TSL.