20 isn't too old, by any means, lol. So you're good, there.
Nursing schools are deluged with applicants, not all of whom are really qualified, but getting into any RN program takes a while, even if it's just to get through the application process. If you can, I'd go for ADRN or BSRN instead of LPN, but LPN is shorter duration, and locally here, it's vastly easier to get into. More LPN schools than RN, more than one class starts per year, and more available LPN seats than RN seats. Plus LPN programs want people who can do college level work, b/c they are easier to train.
Try this training provider list as a shortcut to finding LPN schools, listed as Practical Nursing. There may be more schools but usually the public ones and the established ones will be on these WIA training provider lists. If you are on the border, also look at the similar list for the neighboring state.
Georgia's WIA Eligible Provider List
Most schools will transfer in prereq credits provided they are less than 6 years old or whatever that particular school's policy states. English and math and stuff like that, things that do not change much if any, they might take older credits.
Instead of repeating classes that you don't need, review that subject material yourself. If you don't have your old books, you can buy some old editions of "typical" textbooks cheaply on ebay or from Craigslist or local free ad papers.
I'm no help on the child-rearing issues because I do not have children. Maybe post this question in the GA state forum, if you haven't already.