My Mom is 72.
She walks 2500km per year, so about 7K per day (just under 5mi for you imperialists).
Running shoes for running last 600k ish.
She's wearing running shoes (Asics GT2000 ) and doesn't think she needs to replace them since the soles aren't worn through. Does she need to replace shoes as often as if she were running? She would hate the thought of new shoes every 3 months.