I definitely agree that attribute vs technique is far less nebulous than internal vs. external, but it still becomes more fuzzy the more precisely you try to delineate it. Neurological deterioration is just as much a factor of ageing as "physical" deterioration (again, not a real distinction, as neurons are physical things). So balance, coordination and other things associated with technique also deteriorate. I would say that training throughout the ageing process is a matter of shifting focus from one set of attributes that are deteriorating to another set that are still improving, or at least not deteriorating as quickly as others - particularly sensitivity and timing. You also change how you fight to make up for losses in cardio, strength and balance. Of course, technique is a big factor in this, so your assertion is generally true in a broad sense, but at the same time not technically true once you look deeper into the processes. Being a spritely youth who has yet to hit 40, I am saying this from observations and having learnt a great deal from physio's who specialise in geriatric and neuro rehab, although having trained through a debilitating chronic disease in my 20's I do feel I have a better grasp of it than most martial artists my age.