The body needs to be changed. You won't be able to glue it together. Even if you do something now, after a while the body will still begin to crumble into large pieces. I had this on different Casio after 10+ years of operation.
it is unrealistic to glue. After a couple of broken ears on Casio, I switched to an all-metal Pulsar.
+1, not treated. I also have a casio g-shock in my desk drawer from the year 98 commercials =)