Been a fan pretty much my whole life. My parents were Cowboy fans from East Texas, and while we had moved away from the state... they remained steadfast in their support of the Cowboys.
As a young child I would sit with Mom and Dad and watch Roger Staubach, Tony Dorsett, Newhouse, Hill, Pearson, Richards, etc. and just fell in love with them.
There was never any doubt that my team was the Cowboys and I've never even liked another NFL team. A lot of fans have their "second favorite" team... well not me. There was Dallas and then everyone else... and everyone else could go to hell.