DH and I have been TTC for around 4 years now, though a spell in the licensed trade did not help the cause one bit at all 
DH would be an "older" father and already has 2 grown up children. I have DS(8) who DH is adopting so effectively we do have a family together, albeit I do not have a biological link to DH.
Yet again this month we have not been successful and quite frankly I am starting to wonder whether I do want to continue.
I had blood tests which indicated that I was ovulating (at that point at least) and DH is about to visit the GP for the much dreaded sperm tests.
The thing is we had already promised ourselves that we would put a limit on the time we continued (as if we did not I fear that some years down the line we could end up as one of those stories in the DM about outlandishly old parents after a freak conception) and now, I sort of feel that we have come to that point, despite DH not even seeing the GP. We neither of us want medical intervention, that was decided a long time ago even if we were eligible
It came about really when somebody asked me yet again if I planned to have any more children and rather than my usual answer ("Goodness no, DS is enough of a handful/ we almost have our lives back/ we could not stand the upheaval etc") I felt the time was right to say though I didn't "We did try but it never happened"
Reading back this seems an incredibly morbid and self indulgent post but I feel better for actually writing down my feelings and who knows what the future holds :)