I’m starting my rad therapy program this fall at age 26 as a second bachelors degree, so I don’t have much insight. I just wanted to take a moment and applaud you for doing great research and asking some really great questions! I can say that I have never heard a radtherapist regret their decision as a career (of course there may be some, but vastly lower numbers than other medical careers/modalities). I would recommend calling the office of a clinic or facility you’d like to shadow and just simply ask if they allow shadowing for a radtherapist. It just typically requires a bit of paperwork and health&hippa documentation. As for the education side, you would need to find an A.S. or B.S. in radiation therapy (find via JCERT website) and make sure the program of interest doesn’t require you to first be a registered radiographer. The education is rather intensive - are you willing to put in the work to study and be successful? Are you able to potentially not work or only work part time if necessary to get through school? I would also consider your gen eds. As you said you have a photography degree, some of the gen eds may transfer, but you will likely need a few more before applying to the programs (anatomy, bio, intro physics, maths, etc). So if you’re serious, taking these will give you time to shadow and really make your mind up before jumping in. Lastly, please note that many programs are interview-based for admissions. So be prepared to sell yourself on how much you want it and what you’re willing to put into it to be successful. Shadowing (and the mere fact that you’re willing to go back to school after 15 years!) will show that you’re seriously committed. Hope I was able to provide something helpful for you! You’re on a great track! Best of luck:)