Usually, Apple discontinues their flagship iPhones just a year after they are released. So, they may discontinue iPhone 15 Pro and 15 Pro Max this year after 16 is launched.
iPhone 14 Plus
iPhone 14 Plus was launched following the failure of the mini series, iPhone 12 mini and iPhone 13 mini. This device will be in the past but the iPhone 14 will be around.
iPhone 13
The iPhone 13 is the oldest Apple smartphone available on its website. iPhone 13 may be discontinued as It’s 3 years old and the iPhone 14 will come in that price range
Apple Watch Series 9, Ultra 2 and SE 2
Apple will be launching Watch Series 10 with a bigger display and SE 3 may sport plastic casing to make it affordable and they may discontinue Apple Watch 9, Ultra 2 and SE 2
AirPods 2 and AirPods 3
AirPods 4 will be launched next month in two variants, an entry variant and a mid range. The AirPods 2 and AirPods 3 may be discontinued when the AirPods 4 is launched
iPad Mini 6 and iPad 10
We may see newer versions of Apple's budget iPads and with their introduction. iPad Mini 6 and iPad 10 are likely to be discontinued