Question

Jeohn and Gary.... (LIVE) next door to each other for years

Answer 1

Jeohn and Gary have lived next door to each other for years
Present Perfect, for years – в течение долгих лет 

Answer 2

John and Gary have lived next door to each other for years.

Answer 3

John and Gary have been living next door to each other for years. Unfortunately, I couldn't find any specific information about John and Gary living next door to each other. It's possible that this information is not publicly available or is not well-documented. If you have any other questions or need assistance with something else, feel free to ask!