Looking for advice/reality check - 1 year on a stepdown/ICU floor

Long story short I'm 40 years old (ish) lol and nursing is a second career for me. My previous 20+ years have been administrative and management positions working the typical 9-5 M-F shifts. The 12 hour shifts are quite a challenge for me to get used to. I pretty much enjoy what I'm doing but my back is already killing me from moving the large patients or the patients who are contracted/fighting that we need to reposition every 2 hours in the stepdown and ICU. I'm not sure where to head as I'm not sure my body is going to take the 20+ years of nursing that I need to do. I enjoy the hustle and bustle when our patients have a medical change and we need to find out whats happening so I've considered ED, I enjoy helping the patients and families when patients are terminally ill and making hospice type of decisions, I enjoyed my previous management type of roles -- there are so many nursing options and I'm starting to feel too old to have the time to navigate it all myself so I thought I'd ask here. Hopefully your experiences can help me see the pros and cons of different paths. Any type of input would be greatly appreciated.