When I started wearing his immortality device, I was 28 years of age. After 6 months of wearing it straight, I had "healed" an equivalent of 5475 days, making me 15 equivalent years younger (one day of wearing the immortality device equals 30 days of healing without it). After one year of wearing I was already -1 years old.
This is where the nasty side-effects happened. The body cannot cope with negative age. My bones were literally "changing shape in front of me". I quickly turned into the shape of a zebu. With hooves for hands, I was no longer able to type. All interweb activity was impossible, and so I couldn't get the word out. I tried going down the street to my doctor, but was quickly captured by animal services, and have since spent years under custody.
To this day, i'm still a zebu, only an old zebu. Fortunately, I live with a crazy farmer who heard my "moos" of woe and is able to type for me to get the message out to you before it's too late. There could be hundreds of us zebu-humans out there. Please stop the inhumanity!