Good luck to your DH!! I decided to go back a couple of years ago. I have a Bachelor's but I'm going into a whole different field. I don't have to get another Bachelor's but I might as well considering all the post-bach classes I've had to take! I love it when I see others over 30 (and over 40) in my classes! I joke that I'll be 50 when I finally get my doctorate
Word of warning - you, and your DH, will be amazed (scared?) at how much studying he will have to do. I can't lie - it is not easy. Every semester I would think "oh, I can get this done or that done" but I just couldn't. I was working part-time and volunteering part-time while taking full-time classes and prepping for my doctoral entrance exams. I was burning the candle at both ends and my health suffered, physically and emotionally. If I was not in class, I was studying or sleeping or eating. It was SO much easier when I did this at 18 but I just can't pull an all-nighter anymore, and my mom isn't here to do all the cooking and cleaning and laundry, like she was when I was 18. I can't imagine doing it with kids and I am in awe of those who work, go to school, and have kids
Making a schedule saved my sanity

I now carve out time away from the books, time for me, time for DH, and even time for the dog. I highly suggest your DH make a schedule and stick to it. Schedule in studying time, wife time, kid time, and hobby time. He will need to clear his brain and do something for fun every week or else he'll go nuts.
Vacations are now only on winter or summer breaks, and I don't like that, but what can you do. We also don't go to Disney anymore. We live within 2 hours and used to go every month, usually a couple of times per month, but we gave up our Passes because I couldn't take away a study day (and to be honest, we also had a hard time finding a place to put the dog for a day). We love Disney, but we like to vacation in Europe or go on a cruise, so we do that for one to two weeks at a time. One day we'll get the Passes back, but it was a sacrifice we had to make for now.
My motto is: the time is going to go by anyway so don't focus on how old you are or how long it will take - just do it, enjoy it, and know it will be worth it in the end!