I found an old Fritz in my 'museum' (box of old stuff) and discovered it can run OW 23.05.2.
It is running now, behind my fiber router (lan1)and provides 2 LANs(lan2, lan3) with their own WPA3 wifi network and (for lan2) a wireguard connection to a remote network.
WPA3, wireguard and 340Mb/s up/down (1ms ping), what's not to like.
Thanks, OpenWRT team, for a great project!
This Fritz is over 10 years old, I wonder if other people are using even older hardware.
bcm47xx or early (draft-n) ath79 devices with enough flash/ RAM can exceed 15 years by now, especially the later still run as they've always done. If it makes sense to keep using them, is another topic though, as 802.11ac and newer have really improved the wireless side massively (not to disregard faster CPUs, more flash/ RAM and I/O improvements either); depends on what you're looking for.
In the grand scheme of things, the AVM FRITZ!Box Fon WLAN 7360 (SL) is rather 'comfortable', with its 2*500 MHz mips 34Kc/ lantiq VRX288 SOC, 16 MB flash and 128 MB RAM, AVM has only skimped on the ethernet switch (2*1000BASE-T+2*100BASE-T) and the single-band 2.4 GHz 802.11n wireless.