I'm not an MLC expert, but it doesn't sound like he's MLC to me (usually there would be wreckless spending, affairs, a sudden interest in personal appearance, etc.)
So, I initially read this as you thinking that he DOES have MLC.
I went exploring the resources and found the Midlife for Dummies thread. Except for children and affair, it fits. It was like having someone describe to me in vivid detail what my life has been like for the past year and a half.
And the only reason he's not spending us into the ground is because I have put my foot down around the time when this has started and I no longer let him.
If he does have MLC, I'm honestly not sure what I want to do about this whole situation.
Just my .02 - there does not need to be extreme spending for it to be MLC. And whether it is WAS or MLC - it does not change what YOU do! Advice is what my first post states for either one.
