“Brother... I volunteered to be an Altean knight because I was watching your back, following your steps. ...And that's why it makes me happy to hear that kind of praise from you.”
—Ryan to Gordin in a base conversation in New Mystery of the Emblem
According to the Takayashiki Hideo's Mystery of the Emblem novel adaptation, Ryan is 17 years old. 
Bow - D
He has decent stats across the board, and is generally better than his older brother, Gordin. An annoying problem is that low maximum stat for strength, as he reaches it rather quickly. He's better than Gordin in every stat but luck, which is a trivial difference since Ryan's luck is still pretty decent. However, Ryan struggles from a low base speed, and his growths, while still good, are not quite enough to make up for it. As a result, Ryan is often doubled on harder difficulties, especially in the first few chapters, but reclassing to Myrmidon easily fixes this.
New Mystery of the EmblemEdit
"Ryan stayed in Altea and joined the Temple Knights. Though young, he did his absolute best as a knight."