Well, the body changes over time. I used to drink a ton of coffee back in my 20-30s. Something happened in my 40s. I became very sensitive to caffeine and I couldn’t handle anything more than a cup. Now I can’t drink it on the regular as it will keep me awake at night. I miss it very much, so every now and then I’ll have a cup, but only if I know I have the next day off.