Turning off the preprogrammed cell death (apoptosis) genes will not make you immortal, it will give you CANCER. Cancer is what happens when these genes fail. Cancer tumors are immortal, but I wouldn't want to be one. They are nothing but uncooperative lumps of cells. All muticellular organisms more complicated than amoebas have these apoptosis genes for a reason. They enforce cooperation between various cell types and organs.

In order to have any hope at immortality, it will require continually repairing all the errors that all your cells make in replication. That is what cancer is, the sum total of everything bad you ever did to yourself in your life. That cup of coffee you drank this morning, that time you worked on a model plane when you were 12, and inhaled all that model glue. The mutations slowly add up, and when one cell gets mistreated a bit too much...