First off, you don't need any luck, you have a passion for care giving and that's what will shine through. Second, with the aging population what it is today, being 47 is not that old!! Your desire to be of service to others less able bodied and in need will and is very much appreciated!! You mentioned leaving EMS due to lack of pay and growth; I don't know what your educational background is, but being a CNA doesn't pay much, either. I'm in Los Angeles, and just started a LVN program, about half my class are CNA's, one has been doing it for 12 years and I believe her highest hourly pay grade was about $12-13. In LA, that doesn't go far!!
Depending on what part of the country you're in, and what type of facility you want to work in, the pay may be better. You may want to think about looking into LPN/LVN programs, and if you have some college or even a bachelor's degree, consider looking at doing a 2nd degree program towards a BSN for your RN license.
On another note, speaking from a patient's perspective. I am a 40 year old bi-racial woman (who is always being asked "what are you"? in reference to my ethnicity). I just had my 6th GYN related surgery this past March, the other 7 surgeries were orthopedic in nature (years of dance, soccer and track) YES-a total of 13 procedures!! I am grateful, nothing was life threatening!! I have always, always, always respected the care I've received from nursing and allied healthcare staff based on their willingness to provide care for me (like projectile vomiting at 1AM), their positive attitude and even when stressed/over worked, their dedication. I'd be honored to have you as a caregiver!!
There will always be people who don't accept or like you for something, but usually more that will not only LIKE you, but never forget you for the comfort, peace and care you provided.
So, I guess it won't hurt to wish you luck!!