According to the Japanese site Mac Otakara, Apple will add theiPhone 4, the MacBook Air 13 inches (late 2010), theAirPort Extreme 3rd generation, and theAirPort Time Capsule (mid-2009) to its list of products old and obsolete from October 31st.
As a reminder, old products include devices that have not been manufactured for more than 5 years (for less than 7 years maximum). Obsolete products include devices that have not been manufactured for more than 7 years. Apple no longer performs hardware repairs on all of these products, with exceptions.
The report of Mac Otakara concerns older and obsolete Apple devices in Japan, but these future additions are expected to quickly spread to the U.S., Australia, Canada, and other parts of Asia-Pacific and Europe. Apple has already made CDMA models of the iPhone 4 obsolete all over the world last month, while the MacBook Air in late 2010 will join the iMac in mid-2009, the Mac mini 2010 and the MacBook Pro in mid-2010 from 15 inches and 17 inches on the list of laptops that are no longer supported by Apple.
While macOS Sierra is still compatible with the MacBook Air in late 2010, the iPhone 4 cannot be upgraded beyond iOS 7.1.2. Finally, note that the current MacBook Air has not been updated for nearly 600 days, but the refreshed models (with USB-C ports and OLED bar in particular) are expected by the end of this month.