My 6 y.o. Time capsule just updated...
... For the first time in a year or two. It's outlasted 3 routers, 4 modems and is still supported.
And where all the others have each had numerous remote code execution exploits, most of which are now left unpatched, these TCs, airport/ Apple wifi routers have never suffered one (until perhaps now). But look it's already patched.
Good on you Apple, keep it up. It's because of this kind of support that I buy your kit- this one time capsule is the only one of 10 such devices I have working- let alone still supported!