I was just reading one of the threads and it was mentioned that Aurane Waters was considered to be a potential Aegon. Though I firmly do not believe that Aegon is alive, I will conject about this little theory with Waters.
I don't know his age, but I think he is younger than Cersei for sure, but then again, that might make him too old to be Aegon.
His eyes and hair coloring are rare in Westeros unless you are a Dayne, a Targaryen or a Velryon. Let us not forget though that Cersei also notes that every whore in Lys has those features.
Cersei remarked on at first glance she thought he was Rhaegar. She dreamed of Rhaegar day and night when she was younger so she would know his appearance well. Looking like Rhaegar could be due to tthe fact he might be Aegon.
He kept hinting that he wanted a stronghold of his own because his title as Lord meant nothing without lands and income etc... Cersei thinks on how he was pressing for Dragonstone. Now that could just be because its ancient and was the seat of kings and princes, but then again perhaps there is an ulterior motive behind that if he is indeed Aegon.
Lastly, he set sail with bulk of the new warships and no one knows where. Granted, he could just be a minor character that we might not see again or he could have taken those ships as a first step reclaiming all that was taken from him if he is this Aegon.
Remember, I really really really think Aegon is dead, but I am bored and it is late so I am indulging this wild fantasy for the moment.