Hi,
I have not had regular coffee for 30 years ... and since the doctor put me on blood pressure medication (he's trying to give me diabetes, gangrene and then cancer ... in that order!!!!!) ... I have had a sip or two.
Mostly I drink half a cup, if that, of DECAF ... or Unleaded as I call it!
Lately, I have been taking those low fat expresso mixes and adding a shot or two of coffee to them, so the coffee intake is minor, but you can feel the rush if needed. Generally, with my bad eye sight and being in front of the computer at work, there are days that I can not continue with bad headaches ... time to go home and take a siesta to kill the headache.
But at 61, I'm finding that a bit of coffee is not hurting anything and is helping the day move along ... although I do not recommend using "coffee" as a replacement for your "energy", which I do not do for the most part, but it does help on the last hour of work each day, when things get hard for me visually, and it is foggy and annoying.