Can I connect gas station bought headphones to iPhone 7? If so how?

Can I connect gas station bought headphones to iPhone 7? If so how?

It doesn't matter where you bought them. However, since the iPhone 7 doesn't have a headphone jack, you will need to buy a Lightning to 3.5mm adapter like this

Yes, but only indirectly.

You need either a Lightning to headphone adapter (as MoP says), or a portable Bluetooth audio receiver.

Yup - connectors. I got a few of them off eBay so they are stashed where I need them.

If you use the included adapter you could use any 3.5mm headphone jack device into the 7.