Middle aged?!! I was born in 66 and, to quote the great Doc Holliday - "I'm in my prime"
My emotions actually teeter between two bookends: incredibly excited about this team's future AND anxious to take advantage of our shot when it presents itself.
One thing I think many of us fans over the decades can appreciate is how hard it is to get in this position and seize the moment. I'm sure there were lots of Dolphins fans looking forward to the next 10 years with Dan Marino at the helm when he went to his first Super Bowl. So while I am incredibly bullish about the future based on the character and makeup of this team (particularly when we bolster the defense with more playmakers), I will always have that gnawing feeling of anxiety that we should take advantage when we have the chance and act like there is no tomorrow.
To put these sentiments into a Cowboys' perspective, I think the OP could have been written right before the 2007 season's playoffs and it would have reflected the majority of Boys fans' optimimistic future outlook. But I do believe this version of the team has a culture and mental makeup to indeed seal the deal. I just to want to bank on it to the point of complacency about the present opportunity.
Great topic!