Am I alone in finding this rather offensive
Sorry, it wasn't meant to me. The point I was rather clumsily making was that like many of us, I have been in my current relationship for a significant number of years - over a decade now. Im in my early 50's so it has been since I was late 30's. I spent all of my 40's in this relationship and all of my 50's so far.
Like many of us I've changed in the two decades since I was in my 30's and definitely since my 20's. My interests have changed, as have my responsibilities and my income. The life I was leading when I was last single was very different to the life I would be leading now, should I ever be single again, just because of the age, responsibilities, income etc etc.
So, long term married/partnered up people coming onto a thread like this and saying what they would do if they were single now or what they did do when they were single, are patronising and condescending to people who are over 35 and single, childless now.