Braille can absolutely be learned at any age, and is a godsend for an avid reader. My grandmother learned braille at 72 and it changed her life - she never got into audio books, and I think she also appreciated the community of her local braille library. She also had a braille reader which attached to a console and worked surprisingly well - perhaps ironically she became much more technically capable and comfortable after losing her sight. She used that to write and read email in pine (I set that up for her in the early 2000’s, I’m sure better options exist now.)
My uncles who’ve lost their sight both picked up braille early and have barely skipped a beat. I believe learning and leveraging braille while partially sighted both made it easier to adapt and mitigated the emotional impact of their loss as it progressed.
There are other advances in tactile displays happening every day now, one which I’ve been following is https://pad.dotincorp.com/.
PS. If your mother has AMD (as my family does), be aware that there’s a significant hereditary component. You should be sure to inform your doctor and consider annual ophthalmologist checkups.