question about being on osteoporosis medication for 25+ years

I haven't started any osteoporosis medication yet. I have an appointment next week to start Evenity, but I am still thinking about how my severe osteoporosis will be managed long-term. If I start Evenity when I am about 58, how will I be able to maintain my Evenity bone density gains long-term without having bad side effects using drugs like Reclast/Prolia/Fosamax? It scares me to think about potentially being on those drugs for decades. The alternative would be to take no medications, and watch my T-scores get worse with time. These are my DEXA Scan results from about six months ago:

Lumbar Spine BMD (L1-L4): T-Score: -4.0
Left Hip BMD (Total): T-Score: -3.0
Left Femoral Neck BMD: T-Score: -3.6
Right Hip BMD (Total): T-Score: -2.9
Right Femoral Neck BMD: T-Score: -3.2

Has anyone had experience with being on osteoporosis medication for 20+ years?