Hello MId-Life-Larry: I'm sorry your marital relationship has come to this. I'm 67 (& still married...) I don't know whether or not how you feel is normal. Perhaps, if the road to where you are now has been long & rocky, it's simply a relief for you to be finally reaching the end of it.

Of course, it is possible also that the real impact of what's coming simply hasn't hit yet. However, as long as you're not feeling destroyed, or even very sad, now... perhaps the best course of action is to simply appreciate where you're at, at the moment, & be glad of it. I wish you well...