K.,
how great is all what you describe!!!
Don't ever feel sad that you did not pursue education when you started at 18. Now, you have a great family, life experience, and decided what you like to do. Naturally, the next step is to improve in the area that you like.
I just graduated from Montana State University with the Bachelor's degree - way into my adulthood (with my children being 25,23,18, this is why I congratulate you for following your steps in life, maybe not traditionally, but so wisely). I went trhough the entire course 'in person', on the campus,
but Algebra classes I took from the school that you name.
An amazing and most patient teacher there :)
My suggestion is this:
contact them, call them and tell them your story.
The thing is: while you do core course, and what they already have online, the big chance is that they will be putting more courses online, and end up having the entire set online, too.
BTW, this is exactly what MSU is also doing right now. We already have some courses that are ALL online. This is where the evolution of technology leads us: more options, more flexibility, great for such situations like you have:
when talking to the representative, ask what they have now,
and ask what is upcoming soon: if (s)he does not know for sure, ask for another phone number to talk to those who do, as there is a team of people who are very well aware of the plans and timelines for the entire school.
Good Luck, and all the best to You and Your Family, K.!