Also, as a runner/cyclist - be sure you're running on the whole foot, not just the balls of your feet. Most new runners tend to run up on their feet and that can cause calf cramping. I have also found that increasing my calcium helps with the calf cramps on the rare occasions I get them now (usually as a result of overwork or lack of stretching). One of the things I found that helped me when I started running (geez....20 yrs ago) was to run/walk the distance. Run a block, walk fast for a block, etc etc. It seemed to speed up the "training" process.
As for age, my dad started running for the first time in his life when he was 50 and was running mini-marathons by 52 so pffft on the whole age thing! At least you're out there doing something!!!
and PS: I Always smile when I run.....even if its killing me!...I don't Ever want anyone to see me running without a smile on my face!
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"