Mojave support ends in September 2021. You can still run your 32 bit Adobe apps with free security updates until then. That will have given you at least 10 years of use from your Adobe Suite purchase.

(After that time the apps will still run like they always did, but you may choose to keep that machine offline for security reasons).

I tend to think that's a pretty reasonable value for your money.

Adobe have already done that for Photoshop CS6...

Is Adobe updating the pre-cc‘s? I mean security wise. Acrobat‘s vulnerability’s come to mind.

Edit: I’m pretty sure my 10.13(!) received a security update last month. There will be security updates for 10.14 at least till next years macOS flavor.