Hi. Congratulations on your decision to go back to school! I believe it is never too late. I went back in my early 40s and it was a big adjustment, but it was great! I highly recommend asking for any accommodations you suspect you may need. You will probably need to register with the office for disabled students on campus when you start your new school. In order to register, I was required to provide a doctor's letter describing my condition and listing the accommodations I requested. I also needed to give a copy of that letter to each professor on the 1st day of class. Some things that I asked for were: sitting in the front row of the classroom, near a door or window (because I get migraines from strong scents and cannot concentrate, especially during quizzes or exams). Sitting in front row of class insures less exposure to smells because nobody is in front of you. (It also makes it easier to fidget or stim during 2 hour classes without annoying your classmates

) I also asked to be able to move to another part of the room (especially during exams) if someone's perfume was setting my migraines off. (Some professors assign seating for exams). I also asked for more time to finish exams, because a lot of exams are timed, and I need extra time to think things out. Also, exams that have time limits and/ or a lack of the ability to skip around and go back to questions, really gives me a lot of anxiety and can seriously affect my grade. About half of my exams (in person or remote) were on a computer and were timed. Anxiety badly affects my memory and that is a big problem when you are taking a heavy science based curriculum. I did pre-med undergrad and nutritional biochemistry grad. A lot of memorization and critical thinking was necessary. One of my classmates used to take exams in the disability office so that they could have more quiet and less distractions, as well as extra time for the exams. They were also able to choose which days they wanted to take their exams in the disability office, and did not have to take more than one exam per day. That is a HUGE help, because every one else often had 2 or 3 exams in one day!
Don't be too embarrassed or afraid to ask for accomodations. You really need your brain working right, without any distractions/ environmental setbacks during exams. It is crucial to getting a high GPA, which is needed to graduate. Many medical training programs (for example: all of the nursing schools I know of) do not allow people to retake a class if they get lower than a B grade. So, if they get lower than a B in just one class, they cannot ever graduate, because every class in the curriculum is required.
I also let my professors know that due to my dysautonomia, I might have more than the standard number of absences from class, so that I would not have my grade lowered. Some professors figure class attendance into the final grade. I was never absent more than once per semester, but it is better for the professor to know before something happens. I have heard professors tell students many times in the past, that they needed to tell them if something was going on either before a problem came up (like for a disability), or right when it started (like illness ...the flu etc.). Otherwise, they couldn't help them. Telling the professor you couldn't finish your exam in the time allotted, or didn't finish your assignment on time, after the fact, because of a disability or an illness, will not obligate them to make an exception for you. Many professors might not believe a student who claims a disability or medical issue was the reason, without providing them with a letter at the beginning of the semester or a doctor's note for a recent illness. Students try to get assignment deadline extensions and curves on their grades all of the time, and they come up with the craziest excuses to try to get the professor to help them. A lot of professors suspect everyone of it and are super strict and unhelpful if you do not ask for accommodations in the beginning of the semester. In some schools, professors are not allowed to make exceptions without an accommodation letter. It can be a bit embarassing to have to hand those letters out.. but if something happens and you have an issue, you will be covered. Good Luck