I'm 31 and I know I'm likely a bit behind based on these numbers, but my retirement picture is a little different. Don't have a traditional 401k. Instead there is a part pension, part 401k like account, plus a supplemental 403b account I have. I in total contribute about 11% all said and done which goes to the self-directed accounts, and my employer does 14% which goes to the pension account. It's likely when including the current amount in the pension account, I'm right at the average and at 1/2 my salary. I also have everything set to 100% stocks.
In the future, I may switch fully to self-directed and cancel the pension if only for the reality that I doubt I'll be with this same employer for 30+ years to fully realize a pension payout.
Wife is 29 and is technically above average for that age range and ultimately has a similar total amount as me. She also just switched jobs, so 7% goes into a pension account. And she also has a supplemental account she puts some into. Also, neither of us pay into Social Security, so that will not be factored into our plans at this time.