Comfort bikes? I thought you were talking about "comfortable" bikes. I'm 69 and my road bikes (click on the links in my signature to see them) are very comfortable, even after 40+ miles.
Much of the comfort idea involves finding the correct (translated: comfortable) saddle for whatever bike you ride.
So if you want my two cents don't go with the traditional "comfort" bike. Start with a flat bar road bike and go from there.
Typical flat bar road bike (IMHO) -->
http://www.myjamis.com/SSP%20Applica...cat_grp=strt_2