If I were him, I would ask for rather short term alimony so you can retrain to get back into the job force; probably 4 years or so. He would also have to give a majority of the assets so you can survive with minimal outlay during that time. Or, you split the assets (you would owe him 1/2 the value of the home, but they might be offset with other assets) and have alimony for a longer period of time, say 10 years. As for the estimate dollar amount, it varies greatly from state to state, court to court and judge to judge.
I retrained to be a police officer when I was 40, then changed again at 52 and am now an RN. I barely worked before then as I was with the kids.
What I usually tell folks to do is to look at their proposal, than ask yourself would you feel good about signing it if you were presenting the exact proposal to yourself? If the answer is no, it's time to rethink the proposal.