Welcome. I'm also new and an oldie, though not up to your years yet...59. I'm surprised that, with as many bike shops as are in the DFW area you couldn't find a deal on a bike you liked. But, that does take an investment of time and, these days, gas money. If you haven't put the bike together yet, a bit of expert advice may help. While not new, my 1996 mountain bike is a different animal in the component department than my 1983 road bike. The road bike is easy for me to work on, but, while the mountain bike components are much the same on modern road bikes, they're a bit daunting for this old goat.

Enjoy your new beast, that's what its about.