So, I think I have ran this through with some of you, but here is a consistent effort in showing why I think Seth is younger than both Forde and Kyle. And also hopefully you guys can offer some opinion as well, since I may be letting my biasness for him cloud my deductions.
So, here is my thought process, though not written in a proper argument form.1. Forde and Kyle are probably the same age.
Forde: Ha ha ha ha. Of course not. But I bet you're still a ladies' man, huh?2. Kyle was probably already a knight ten years ago thanks to the mission he was sent on, and thus probably so was Forde a knight.
I know you--you're a perfect gentlemen, always nice to the ladies. I remember
when you were little, you were always the first to help when you saw a little
girl crying. You would go running up to lend a hand. I still remember how
impressed I was that you would do that. It was cool.
- Forde/Kyle C
Forde: Oh, you're one to talk. When you were a baby, you were planning out
strategies to take over the nursery. You were stuck up then, and stuck up now.
And STILL the ladies liked you!
- Forde/Kyle C
Syrene: We met once, about ten years ago or so. You may have forgotten.
Kyle: Ten years ago... Wait, you're... THAT Syrene!?
- Kyle/Syrene C
Kyle: I'm sorry about that, Syrene. I had no idea... I was on a special4. A squire is probably younger than a knight.5. Therefore, probably, Seth is younger than both Forde and Kyle.
mission to deliver a letter to King Hayden. I didn't have any time for
sightseeing, like I'd said.
- Kyle/Syrene C
3. Ten years ago, Seth was probably still a squire.
Seth: When I was just a squire, there was one knight whom I admired above all
others. His skill with sword and spear was legendary. He was truly peerless.
We squires learned the meaning of chivalry watching him serve the king.
Ten years back, we received word that an infamous assassin was hiding in
Renais... - Seth/Franz A
Now, quite a bit of assumptions here. If Seth is indeed younger than them, the question then becomes how young? And what is his age? If we go by the FE tendency to not have young-ish looking characters being too old, we can set an upper limit of Forde and Kyle's age at... 28~30? Since it is not too unreasonable to say that they attain knighthood at 18~20. It is a probable upper limit, so they could be younger for all we know.
Considering the age of historic squires, they go from page to squires at about 13~14. After a few years, if they prove themselves somewhat, then they get knighted. So, if we take Kyle's mission then to be when he was still a very green knight, he was likely...18, or maybe even 17, and Seth to be a very senior squire, then his age would be...15~16, even 17? So the minimal age difference would be around 2 years. On the other hand, if we assume Kyle to be relatively experienced by then (a special mission, which either means an important courier message, or that just a mission to test out their newest knight), and Seth to be a new squire, we are looking at an age difference of 5~6, even 7, if you feel generous with either of their age.
My own head canon puts Kyle/Forde at 28, and Seth at 23~24.
Now that is over, I can ramble a bit about why I find Seth to be quite intriguing. At the start of FE8 it was mentioned that there was peace for the past 800 years or so. So, no general warfare, maybe border skirmishes when you have some bad blood. But for the current batch, everyone seem to get along before good old Demon King subjugated Lyon. In times of war, people get promoted fast because of casualty. In times of relative peace, not so much. So within 10 years of being a squire, he went from Squire Seth to General Seth, leader of the Knights of Renais.
In the meanwhile, he overtook people like Forde, Kyle, Orson, and the other knights. Not to mention, he also earned himself the name of the "Silver Knight" before the war even started. I think in FE8, only Marisa shares the same priviledge, being known as the Crimson Flash for her exploits as a mercenary. Not only that, he seems to be
respected not only by fellow knights, but also by people from other nations.
Franz: Oh, so sorry... I appreciate your praise, sir.
I mean, you're General Seth, the Silver Knight. You're my hero. Seth: Hahaha... No more flattery, Franz. Please.
Franz: But, General, it's true! Do you remember when Grado's forces overran
Castle Renais? Despite grave injuries, you outcharged the enemy, broke their
lines, and escaped. And then, you delivered the princess, on your own,
to Frelia safety. If I were you, I doubt I could have survived such a
challenge... You are the only person I know who can make impossible feats
Cormag: I know you. Of course I know you. You're General Seth, the Silver
Knight. Cormag: If the legendary Silver Knight knows my name, I can't be doing too
- Both from Seth/Cormag C
Forde: Never mind. Not important. Anyway, I'm shocked. SHOCKED. Yeah,
if you need a role model, look to General Seth.
Yeap, legendary. Thus why I find him so intriguing, and love to explore how he became what we see in FE8. And I think I still have things to say, but I shall stop my ramble here. ^^;