They're losing games because the roster is just not that talented because of years of poor drafting. I'm not sure you even thought about what you said about the Super Bowl team, but you couldn't be more wrong. Flacco was in his 5th year, Rice isn't even 30 yet, Bernard Pierce was a rookie, Torrey Smith was young, Pitta in his 3rd year, Osemele was a rookie, Arthur Jones in his 3rd year, McPhee in his 2nd, Kruger still on his rookie deal, Upshaw was a rookie, Jimmy Smith a 2nd year player. And Jimmy Smith rarely saw the field his rookie year because he hurt his ankle on the opening kickoff.
This team isn't bad because of players "aging quickly". It's bad because the front office drafted terribly in recent years and had to use the extra cap money to fix up their mistakes instead of make the team better (Weddle/Elam, Dumervil/Upshaw, Wallace/insane amount of failed receiver picks).