After reading your profile and seeing your stats, I would have to say that Deca for 8 weeks is a bad idea. It takes quite long for Deca to build up and recommended cycle lengths with Deca is usually 12-16 weeks. It is also advised that you run Deca with Test. Now if your mind is made up on Deca, I would suggest the shorter ester, Nandrolone Phenylpropionate (NPP). An 8 week NPP and Test Prop cycle would be your best bet if you are only wanting to go on for 8 weeks. I would also suggest you get AS LEAN AS YOU CAN before starting your cycle. The reason being is that the leaner you are, the less sides you are going to encounter and the more and better gains you will make, due to the low estrogen floating around in your body. Getting bloodwork done before the cycle is another MUST, just so you know where you are at, and another bloodwork after the cycle. Tren might be a little too rough for you consider you are 60 years young. Tren trashes your lipids and blood pressure FAST, not to mention its wicked sides like insomnia, night sweats, and the awful occassional tren cough.