Grandmabatty
I have always been organised and I still am. I found the Mumsnet thread very ageist and fake 'amused at these old doddery parents '. I suspect it may take some folk longer to make decisions because that's their nature. Nothing to do with their age
I haven't read the Mumsnet page, but suspect that what we are dealing with here is really that at some point when we are adults (for me it was between 30 -40 it was worse) our parents and their contemporaries begin to annoy us.
I felt mine were making endless demands on my time, never realising that I was working full time because they had retired, and seemed to expect that I could and would help them with anything they felt they needed help with IMMEDIATELY.
As a teenager living at home, I had been expected to help promptly when asked (fair enough). This attitude was carried on especially by my mother, at at time in my life where it was no longer reasonable for her to expect it.
This had nothing to do with her getting older or with "faffing about" simply the much more common inability of mothers with grown up children to accept that their children are now adults with jobs and family commitments apart from parents.
So no, nothing to do with aging. If I start something, I still want to finish it fairly quickly. This has always been my nature, as apposed to others, DH amongst them, who are content to take absolute AGES to finish anything they have started ,or to make up their minds.
As yet, at 72, I have not noticed it taking me longer to make up my mind, although not having the strength I had forty years ago, it may take me a litlle longer to finish a project I have started.