He is at least 40.
It seems like it they thought he was rehabilitated they would have paroled him around age 30. Police say once a person reaches 30, the likelihood of crime is much less.
The fact they waited until 40 is a red flag that they either messed up 10 years ago, or they are messing up now. How do you start a life at 40 when 2/3rds of your life has been behind bars?
He’s probably a psychopath. You can’t cure that.