Others have answered the question for me.
The Surname Interests table is there to be searched. Its only when you click onto someone's profile that you can tell that they last accessed RC when Noah was a lad.
Similarly with general searches - and I too have fallen foul of spending time trying to help individuals who posted many moons ago but had recently been answered by someone else trying to be helpful.
Yes - I suppose I could click onto everyone's profile before I communicate with them but I have a life... surely, it isn't beyond the powers that be to come up with something (perhaps a colour code) to highlight those who haven't been active for, say, over 2 years.
Moderators always seem to be looking for someone to annoy - try the lapsers!!
