I can't tell you how rough the seas were coming over from Scotland, but I can tell you that one member of our party left the ship at Hofn to make arrangements to fly back to the United States--without his baggage. We never saw him again. I assume that he had his passport and his wallet. He'd had enough. This may be fair warning to anyone who's thinking of going to Iceland by ship from Great Britain. Frankly I enjoyed the trip. It takes all kinds of people to make a world.
Age didn't seem to be a factor in who managed the crossing well and who didn't. One spry woman very well up in years, seemed to do very well. Another couple, both in their 80's, were at the head of the pack on every hike and every activity. You know yourself and what you can do. If you haven't traveled by sea before, I don't think I would have this as a first trip.
The M.V. Explorer makes a number of interesting trips in the north Atlantic. I'm interested in trips offered by Travel Wild Maritime Britain.