Indy,
The major flaw in your reasoning is that older folks represent the wealthiest cohort of our population as segmented by age.
I can tell you that my late father and still living mother were much freer with coin after retirement than they were before.
Had my father had any interest in something as mudane as motor oil, both cars would have gotten Amsoil post-retirement, at the least.
Most people retire either because they have to, due to ill health, or because they can afford to.
Those who can afford to usually have the savings to do what they never did pre-retirement.
Check out the average age of Porsche, Corvette or Ferrari buyers, for example.
I'll give you a hint.
They aren't especially young.
In short, while we may be seeing the potential for deflation, it won't be driven by retirements, but rather by the lower paying and relatively scarce jobs now available to new entrants and the unemployed.