Monoprice via Rakuten offers the Monoprice DJ Style Over-the-Ear Pro Headphones, model no. 8323, for $17.99 with free shipping. Plus, coupon code "SUPER15" yields 270 Rakuten Super Points, which are redeemable for a $2.70 Rakuten Shopping credit. Assuming you'll use the credit, that's $3 under our December mention and the lowest total price we could find by $17. They feature 50mm drivers, 20Hz to 20kHz frequency range, and a 11.5-foot cable.
There are many ways for seniors to get cheap -- and even free -- entertainment and services.