Aegon the Unworthy! Gosh, I didn't think it was arguing.. only a friendly conversation

About the age of Sarella and Aegon:
"What of Sarella? She is a woman grown, almost twenty.”
THE CAPTAIN OF GUARDS (at the end..)
Aegon must be about 16-17, 'cos when he "died" he was a babe at breast (And Dany was born short time after that):
Viserys had been a boy of eight when they fled King’s Landing to escape the advancing armies of the Usurper, but Daenerys had been only a quickening in their mother’s womb.
All that shows that Aegon is a few (1-2) years older than Dany. If Dany was forteen at the begining of her pregnancy, she must be 15-16 now..
Alleras is "a comely youth", his skin "was dark as teak" - which is not black! And he's half Dornish. Sure, his story reminds Sarella's ("his father was a Dornishman, his mother a black-skinned Summer Islander"), but why not? After all, the name he chose reminds Sirella's as well!
And I think that the talk of the dragonglass candle (that can be lit only when there are dragons) lit in the Citadel just when Alleras gets there (a year ago) is not a coincidence. Might be it was Alleras (Aegon the Dragon) who has lit it? And another thing - have you noticed that Alleras is a very talanted scholar? ... just like Rhaegar! (Three links in one year...) And I think that Marwyn's discussion of the Dragons in the presence of Alleras (a mere acolyte?) is not a coincidence as well.
But the most important argument is - consider the fourth person present at this conversation (Sam is the third). Pate? Or, should I say - Jaqen H'ghar? There must be a very important reason for a Faceless Man to be at the Citadel. Moreover, he is there for a long time (since the beginning of AFFC), and I cannot think of a better reason than protecting the Targaryen Heir.
I don't think Aemon knew anything about Aegon's life or death; he came to understanding that the prophecy was about Dany being the "Chosen One". However, this does not contradict the fact that the dragon has three heads (which is another prophecy). I guess that his phrase "the Sphinx is the riddle" talks of yet another prophecy or some other strange insight that he might have, but why can't it be about Alleras the Sphinx?
About Viper making no difference between Aegon or Rhaenys during the fight with the Mountain - I guess he would be rather stupid if he did, wouldn't he?