Current devices:
AirPort Extreme, circa 2009; it's currently configured as my main wireless router, relegating my internet gateway to modem/DHCP master.
iMac, late 2010: My main computer.
Macbook Pro, 2010: My main laptop.
iMac, 2011: My wife's main computer.
2 iPod nano 5th gen: Both mine. The blue one is my primary music player; the silver one is a backup that sees only occasional use.
iPod touch, 4th gen: My wife's.
iPod touch, 3rd gen: My child's (was once my wife's).
iPod shuffle, 4th gen, pink: My child's; now rarely used.
2 iPhone 5: One each for me and my wife.
iPad 4: Shared, though my wife is the primary user by a considerable margin.
3 Apple TVs (two 2s, one 3): Allows us to watch movies on any computer's iTunes library.
Former Apple devices (and not former by choice-- they were stolen; I posted it in a thread when it happened):
iPod nano, 2nd gen blue, with matching dock: My first ever digital music player, and my gateway into the Apple hardware ecosystem. Replaced by my silver 5th gen nano.
iMac, 2007 aluminum: My first OS X-based computer. Replaced by my current iMac.
Apple TV 2: I had installed it just a few weeks before the burglary; replaced with ATV2.
This post was in 2013. I'd say that four years is long enough for an update, don't you?
Retired from above "Current Devices" list:
AirPort Extreme. I've upgraded my internet gateway, and its built-in WiFi is 802.11ac, surpassing the AEBS, which is now in a storage cabinet, in its original box.
iPod touches, 4th and 3rd gen. In a drawer somewhere; their replacements are below.
iPhone 5 (both). Replaced (see below); one is now my child's phone, and the other (mine) was traded in-- the battery barely held enough charge for a day on standby, and had developed an annoying habit of dropping suddenly from 40% straight to 1%.
New since above list:
All three Macs above are still up and running; all have been upgraded to Sierra.
Macbook Air, late 2013: My child's laptop, still running its original Mavericks.
iMac G4, 15" 1.0 GHz (Sep 2003 version): A freebie from my wife's former boss when that business closed; I consider myself extremely fortunate to have one of these classics in my collection. I've upgraded it to Leopard; however, it's primarily a museum piece. I occasionally fire it up just to let the screen saver run with a whole bunch of beach, waterfall and city-scape pictures on the Ken Burns zoom-style transition.
iPod shuffle, 3rd gen: My wife got it free as a promo item from a vendor representative at her workplace. Used rarely, because she got an...
iPod shuffle, 4th gen: Pink like my child's. My wife prefers this, as she can use non-Apple headphones with it.
iPod touch, 5th gen: Blue. This replaced the 3rd gen touch for my child.
2
iPhone 7 Plus: One (space grey) for me to replace my iPhone 5, the other (rose gold) to replace both my wife's 4th gen touch and iPhone 5 (passed down to my child).
iPad, 5th gen/2017: Purchased at the same time as the iPhone 7s.