Connect your new MacBook (or any USB-C or Thunderbolt 3 enabled computers) to older USB ports by using the USB-C to USB 3.0 cable.
LONG 3FT USB-C to USB-A 3.0 Cable Type C 3.1 Fast Charging Data
Scosche STRIKELINE USB 3.0 Type-C Male to USB Type-A Male
Astrum USB 3.0-A to USB-C Charge and Sync Cable
USB 3.0 Type C Charge and Sync Cable
3.1 USB-A to USB-C Cable - 3.3ft/1m, 10Gpbs
USB Type C Cable, Anker PowerLine+ USB C to USB 3.0
Olixar 1.5m L Shaped USB-C to C Right Angled Braided Charge and
Generic USB Type C To USB 3.0 Adapter Charge And Sync Cable OTG
USB-A 3.0 Male to USB-C 3.1 Left/Right Angled Male Charge Sync Cable