Shoes with a wide toe box made of mesh would be the best. I would also buy some hammer toe crest pads online to help straighten toes.
Kathleen Neuhoff, DPM
Patients that are your age and are already developing hammertoes should certainly only wear shoes with a deep and wide toe box and also shoes with stretchable material over the toes. There are a wide array of choices as far a brands are concerned. Orthofeet and Aetrex are some examples that have men's and women’s shoe gear. As far as athletic shoes are concerned, I would use a brand you are comfortable with that has options with a stretchable and accommodating toe box.
I hope this helps! Have a great day.
Jonathan M. Kletz, DPM