I felt like shit at first until my body adjusted to things.
Rest easy knowing that you`ll never catch up to me agewise! 
ha ha ~ they say we are only as old as we feel, but you and i know that is total bullshit.
You should have a training website for those older folks who need to know.... everything. There are not many older dudes who can handle staying in top shape. It's rare. I would not be surprised if you were the most ripped and the oldest dude in your gym.
I know I am, but that ain't sayin much. Everyone wants to socialize and spend hours on the treadmills. Crazy, this thing we call bodybuilding.