There was a short but interesting post on the value of seniority. It's written from the perspective of someone that gets a new co-worker, but the co-worker is from the future. In fact, it's the future you. The post is actually titled senior engineers are living in the future.

We (hopefully) are more capable and impressive over time. I would hope most of us are learning more each day and our work reflects that. The code you write today should be better than what you wrote last month or last year. The choices you make, the bugs you solve, the experience you bring to work often does reflect your seniority. Not always, but often.

Read the rest of The Value of Seniority