You'll have to check with the schools
of nursing in your area (assuming you don't want to move). Some schools offer evening/weekend programs and some do not. If it is a legitimate school and they offer such a program, then the local hospitals will probably have no problem hiring their graduates. However, there might not be a school in your area that offers such a program.
The online option doesn't work as well for nursing as it does for other fields as there is no way you can get "supervised clinical practice with actual patients" online. There are one or two programs that offer degrees that way, but they are not well-respected, some states do not give licenses to their graduates, and even if they can get a license in your state, some hospitals hesitate to hire their graduates. I'd avoid going that route if at all possible.
As far as your age goes ... you are right to ask the question. Nursing can be hard physical work -- especially working rotating shifts. A lot of "older" nurses (and I am 50 years old) struggle with those night shifts and some decide they don't like working weekends, holidays, etc. I have met many people who went into nursing as a 2nd or 3rd career who never fully considered how they would feel about those work hours and how tough nursing would be on their bodies. Some people who are enthusiastic when they are students decide quickly after graduation that they are not at the right time of their lives to want to stress themselves that much.
Finally, don't forget that education is expensive. Do you have the money to pay for school? ... or will you be entering your new career in your mid-50's deeply in dept with educational loans to pay off? Taking out big loans at that time in your life can be stressful because you have a "shorter future" in which to pay them back.
Of course ... you will find other people who have successfully made the transition to nursing while in their 50's. They are in excellent health and stay that way for several more years. They don't mind the extra stress and all the adjustments that a new career brings. It's the fulfillment of their dream and that makes up for all the problems.
Only you can make that decision ... but I hope I have given you a few things to think about.