I was using an old Acer Chromebook. I powered it up and it told me it was at the End Of Life and would not get any more updates. I acknowledged this and told it not to remind me again. 

It still seems to work fine for the things I do with it. Does anyone know what terrible fate awaits me if I just keep using it ..... ?

My understanding was that CB's are so simple and (relatively) dumb that security is not really an issue. Or is that just because Google has done such a great job up to now? I have never heard of a CB having virus or worm trouble, but that might be because I haven't looked ......