Am I crazy to be considering a full race frame as a newbie and at my age? Most of my rides will be 25 miles or less I would imagine....more like 10 - 15.
Goodness - you are
50?
I would suggest something with an electric assist. Otherwise, how ar you going to make it up your driveway? 
Heck, if you have the $$, buy anything you like. However, it generally takes about a year of riding until one knows more exactly what they want, and that will change over the years. I am 70, and am still making some changes.
And, don't kid yourself. It won't be long until a 10-15 mile ride seems like nothing, a 25 miler is a "short ride" and you will be heading out for 50 - 100 mile rides.
Mostly, have fun.