My gelding was diagnosed with SCC on his penis when he was 25. He had no other health issues. My vet said she could surgically remove the tip of his penis, but she agreed with me when I said that at his age, that would be torture for him. She also said the SCC wouldn't kill him, but at some point we would have to consider quality of life.
He was bright eyed, with a delightful personality and reveled in life. With my vets supervision and advice, he allowed me to treat the condition for 3 years, cleaning his sheath several times a week to keep irritation down. He remained vibrant, bright eyed and still loving life through most of those 3 years. He didn't drop to pee either, and would lift his leg like a dog to pee.
He let me know when he was ready to go. I could see the pain in his eyes, and that's when I had him euthanized.
Not sure if any of this helps you, but if he's comfortable and not in pain, discuss with your vet ways you can help in minimizing the problems associated with SCC and what you can personally do to keep him comfortable for as long as possible.