Field Gulls' own Davis Hsu recently sent me a "way too early" roster prediction for the 2016 season and part of that are a couple of pretty illuminating infographic spreadsheets, laid out to show how Seattle's roster is constructed with regards to age and draft year.
Seahawks Roster by Draft Year:
Just looking at it from afar, you can see the offense on the left and the defense on the right. Clearly, a bigger portion of the offense is spread out over the last three Drafts (Seattle chose 8 offense this year, for instance), and there are a few older players on the defense.
The blue boxes represent "organic" Seattle players, i.e., the ones drafted by this team, and the green boxes are outside free agents. Overall, it's pretty staggering how much of Seattle's roster is made up of homegrown players.
Note: Technically speaking, Patrick Lewis is not an organic player, but he did not see any significant time for any other club. You could probably make his box blue here, but it's currently not.
It's also pretty interesting to see that the Seahawks have formed their offense around Russell Wilson -- almost all skill players (except Doug Baldwin and Jimmy Graham) came to the team after (or the same year) Wilson was drafted, and Graham was acquired in a trade, so really it's everyone except Baldwin. They are building around him for the long-run, which makes complete sense.
The 2013 Draft is something to note, and you can see that really only three players from that draft year are still on the club. That class was recently given an F- grade by Greg Bedard (pretty fairly, really), and when compared to other years, really stands out from a team-building point of view. You can't miss on that many players and keep your roster as healthy as it needs to be without spending too much money in free agency.
Seahawks Roster by Age:
As you can see below, the offense skews a little younger than the defense. That makes sense -- more of Seattle's second-contract guys come from that side of the ball. Last I saw, Seattle's defensive spending comes in second only to the Jaguars.
Overall, obviously, this is still a pretty damn young roster though.
Top 14 on offense and defense (starters plus key role players)
Obviously, you'd weight the main contributors when looking to determine the real "age" of a roster. Here's a look at projected starters for each side, with their ages as of September.
The key offensive players (top-14) average out to be 25.51 years old. This is a young offense.
On defense, the key players average out to be 27.73 years old. The defense is starting to age -- three of the starting defensive linemen are 30 years old, and guys like Richard Sherman and Kam Chancellor are 28.
Overall, the key players on this roster, as of right now, average out to be about 26.62 years old.
As Davis noted in an email to me, the defense has about two years left as currently constructed. It's about two years older on average than the offense, when you look at the starters or top-14 players on each side of the ball.
Interesting stuff from Davis. A lot to glean here with regards to how the roster is constructed.