Can I use my USB cord from my old iphone 7 on my new iphone 13

Yes, because the cable for your iPhone 7 has a Lightning port which the iPhone 13 can accept. Now, with regards to charging, you may not get the fastest speeds available unless you use the USB-C to Lightning cable that comes included with a new iPhone 13 and a power adapter that accepts USB-C.

Hello ~ Keep on posting and helping …you are doing good work.

~Katana-San~

Yes

Thanks Katana-San, same to you as well!