How can I clean up the old Linux kernel

 pacman -Q | grep "^linux"
linux 5.18.6.arch1-1
linux-api-headers 5.17.5-2
linux-firmware 20220610.7b71b75-1
linux-firmware-whence 20220610.7b71b75-1
linux-headers 5.18.6.arch1-1
linux-zen 5.18.6.zen1-1
linux-zen-headers 5.18.6.zen1-1

But when I start up my computer, I can see that there are many versions of kernel to choose.