Eureka
This does make so much sense, It's wonderful that after being together so long that you two are talking about what you both want for your future.
The age difference doesn't effect the way each of you feel but he is looking at the future as being 10 years closer then you are.
He will be close to retirement while your youngest child is still in college. He knows that if your mortgage is paid-in-full or very close to being paid off it will be easier financially. (Smart Man)
I have one year left on my mortgage while I could go ahead and pay it off now, with my interest rate of 1.5% it isn't financially worth it because I'm earning more then 1.5% on money that is invested.
Now that you will be working full-time with a guaranteed paycheck would it be possible for you to take some freelance work on the side and put the extra money on the credit card debt?
You are doing great either way, just keep that communication with each other open and you will have any problems cut in half.