Should I Move or Should I Stay ?

I'm 27 & an only child. I never went away to college in fact I'm just now really attending soon to graduate & working of course full- time. That said I currenly live with my mother who is 66. She's not at all what most people think of at age 66. She's very active & quiet independant. However I've started to notice some small memory loss issues, visual issues. Things that generally deterate with age. Point being I despretly want to move out. I've reached a point were I feel bad for wanting to leave because I know that she's getting to a point where she needs to be around family, but when we are all the family the other has though it's hard to just up and leave. What should I do ?