Hanes offers its Hanes Men's ComfortBlend EcoSmart Sweatpants in several colors (Charcoal Heather pictured) for $9.29. In-cart, they drop to $7.43. With free shipping, that's the lowest price we could find by a buck. They're available in select sizes from S to XXL.
There are many ways to get cheap and even free services and goods after reaching a certain age.