when will ventura be compatible on MacBook Air (Early 2015)

According to Apple's webpage for Ventura, it is only compatible with the 2018 and later MacBook Air. They won't add support later on for older models.

wright2000 wrote:

Please when will ventura be compatible on MacBook Air (Early 2015)?

Never. Macs capable of running Ventura include:

macOS Ventura is compatible with these computers - Apple Support