I would never say that someone is "too old to be a nurse." But you do need to be realistic about the realities of your situation -- both in terms of age and finances.
I notice that the previous poster who says that "age is just a number" is only 27 years old -- and her mother is only 50. Neitheir of them has yet to experience some of the physical and mental issues that come with age over 50 that will influence your ability and desire to work certain nursing jobs
. Have you ever worked the night ****? rotating shifts? holidays? etc. How is your body going to handle the physical stresses of nursing 10 years? etc. While everyone wants to think that THEY will be one of the lucky ones whose mind and body functions at a high level well into their 70's, for most people that is NOT the case.
Listen to what old, experienced nurses have to say about the effect of nursing on their bodies and lives. Then assess your own situation in light of their experience with aging as a nurse.
The same is true of finances. Young people have long careers ahead of them to pay off any debt they incur during school and save for retirement. You won't. So think that through carefully before you risk your financial security. There are no "scholarships" or "loans" for retirement. At some point in the not-so-distant future, you will have to live off your savings (plus whatever government assistance you get, such as Social Security). Be sure you don't squander your chance to build those savings now.
As for the BS plus and ADN ... that wouldn't get you an interview at my hospital. As a new grad, we only hire BSN's. Yes, that varies from place to place ... but in most places, the ADN will be a disadvantage even if just a slight one. It may limit your job choices.
There are lots of ways to help people, not just nursing. If your soul/spirit needs to find more fulfillment than it is getting from your current career ...explore all of those possibilities before risking your financial security on nursing. There are lots of options.
If you decide that only nursing will give you a life worth living ... then by all means "go for it." I wish you the best of luck. Really, I do. But I have seen too many people in your situation throw away too much time and money on nursing dreams that only disappoint them in the end to not recommend that you seriously consider other options first.