The cluster munition warheads may be timed out, but the missile systems they are mounting them on are not timed out and GTG.
We have bombs made decades ago but does not mean that the F35 they mount them on are ready for the scrap yard
The missile bodies (called the M26) are overtime too.
Thats why they started modding them by replacing the cluster warheads with SDB’s (the Air Force Small Diameter Bomb, which is a GPS guided glide munition), to make GLSDBs. On the face of it a quick and cheap way to re-use the abundant M26’s and the also abundant SDBs.
As it turns out the SDBs GPS implememtation is too easy to jam, so that project is on hold.
Lots of background info on the M26 (rocket body used in MLRS/HIMARS projectiles).
https://en.wikipedia.org/wiki/Ground_Launched_Small_Diameter_Bomb