Most likely, yes. I don't know of anyone that has had their characters deleted for an extended absence. I think officially, SOE only supports 3 months.
I cancelled my EQ account in Oct 2002 and came back in May of 05 and all of my characters that where above lvl 10 where still there. Even the characters that had server merges.
Characters should still be there if they were above level 10. However, some of your items may not be there. I unsubscribed for 3 months and on some (not all) characters their stacks of 20 items turned into stacks of 1. Pain in the **** since it affected most of my smithing mules and I lost well over 100k worth of smithing supplies but it was better then having them deleted.