Dallas has a young team. Inexperience could be a problem as things get down to the end of the season, but it may also be an advantage for them.
The NFL is a young man's game. It's hard for older players to withstand the rigors of a 16-game NFL season and be as productive at the end as they are at the beginning. Older players get hurt more frequently and take longer to heal.
If these Cowboys, who have the NFL's best record (10-1) and point differential (103) fall apart in December, it won't happen because they're too old to handle the season.