A few weeks ago, I discussed why I selected D’Brickashaw Ferguson as my left tackle in the RSP Writer’s Project. In the comments to that post, mrh argued that tackles generally don’t age that well, a proposition I never really considered before. I have previously discussed quarterback age curves and examined running back aging patterns last summer, so I’ve decided to take a closer look at offensive tackles.

First, I grouped together all tackles who entered the league since 1970 and recorded at least four seasons with an Approximate Value of at least 8 points (Ferguson has three seasons with an AV of 8 and two more with an AV of 9). That gave me a group of 78 tackles who were above-average players in their prime. As it turns out, they didn’t age very well as a group, and the results probably underestimate the true effects of age.

As I’ve discussed before, there are two ways to measure group production over a number of a seasons. In the graph below, the red line shows the aging patterns of top tackles when you divide their total AV accumulated by tackles at that age by 78; the blue line shows the age curves when you divide the total AV accumulated only by those tackles active in the NFL at that age.
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Kruger takes down Andrew Luck.

After selecting Josh Freeman, Julio Jones and Brandon Marshall early in the draft, I needed to use my picks in rounds 4 and 5 to build the core of the rest of my team. The two most critical positions I had ignored were left tackle and pass rusher. Fortunately my need largely coincided with what was left: I didn’t see a true difference maker at corner or defensive tackle, so it was easy to focus on 3-4 outside linebackers and 4-3 ends.

On offense, my choice at left tackle was made easy once Jake Long, Trent Williams, and Tyron Smith went off the board at the end of round four. I had D’Brickashaw Ferguson with those four in my final tier of what I would consider above-average left tackles, and Ferguson ranked second to only Williams. His reputation took a bit of a hit with a a poor 2011 and the Jets general implosion since then, but Ferguson quietly had a nice rebound season last year. He allowed only two sacks in 2012 according to Pro Football Focus, and came in as PFF’s #7 left tackle. He’ll only turn 30 in December, so I think my team can count on him for another five years at least. He’s got size and great athleticism, and keeps himself in good shape, so he seems unlikely to fall off a click as he ages. As the 14th offensive tackle off the board, I think Ferguson represents strong value this late in the draft. He’s capable of being a franchise left tackle, which makes him a pick I can feel comfortable about at the end of the fourth round.
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