Elevated BP, cholesterol, liver enzymes, CM levels and many other things that are cause by AAS are not good for your health. Same goes for eating junk food, drinking too much alcohol, eating too much sugar, smoking cigs or taking rec drugs.
There are long and short term side effects from using AAS, anyone who discounts this is foolish. It just depends on how much you take for how long. You can easily use them safely for long periods if you are doing blood work to catch problems.
I've used AAS for over 12 years, I've stayed on for 3 years straight and my blood work was always a little on the bad side. If you compare blood work from being on to being off for extended periods of time, it's quite obvious AAS increase your chances to have health problems.
If you follow a healthy diet, do cardio and stay at an acceptable bodyweight, i believe 100% that you can use AAS for decades without having life threatening side effects. It's the guys that throw caution to the wind and don't ever get blood work that end up with medical issues. I've known many guys who had serious health problems from using AAS, but these were guys who pushed the limits and didn't live a healthy lifestyle.
Bottom line, be cautious with your doses, eat healthy, stay at a reasonable body weight and get blood work done.