AT 39, 12 weeks wont get you 15lbs of mass. Yeah, your scale will tip on the +20lbs side after week 8 or 9, maybe 10, but after you add in Var or Winny and properly use the AI and PCT, you will not see the gains you want. Gains are diet, you know that, so I wont waste your time.
12 weeks is just not enough time to grow the right way and Var and or Winny literally shrink your muscle bellies on the back end of a cycle. When I hear the word hump, plateau or stalled, I look at 1. have I changed my training enough weekly to stimulate the muscle continually, 2. am I resting enough 3. is my diet different each week to where my body is not becoming immune the same macro nutrient builds and then 4 whats my cycle actually doing in my body.
If you want to get 15, you will gain 30, and after PCT keep 15.
I would do 20 weeks of Test E/C or Sust at 500mgs and 600mgs of EQ for 18 weeks. I would front load with the VAR at 75-100mgs per day.
This is your first cycle, usually we say 1 compound, but Var and EQ are both mild and you are 39, not 25.
I never stepped into a gym until after my first wife left me 10 days before xmas in 2005, now I am married to a figure competitor, you are better off.
Bulletproof
PLEASE DON'T SOURCE CHECK ME. I AM NOT A DR, DIETICIAN OR SCIENTIST. MY ADVICE IS BASED OFF OF ASSUMPTIONS.
Nothing is impossible-
"Whether you think you can do it or don't think you can do it, you are probably right" - Henry Ford via Jay Cutler, 2011 MD post Olympia Loss to Phil Heath