Tim did say he was talking about decline based on age. I read it that Zobrist is the only guy who is so old you have to expect decline. He also specified offense. I can't speak for Tim, but I'm sure he'd agree that Baez is also likely to regress, but thats a matter of regression to the mean, not way-past-peak age. I have to say I agree with what he wrote, and think you would too if he expounded. Nope. Especially as it's become more and more clear how early players' peaks are, especially when it comes to offensive output. I've seen some of the articles on peaks coming earlier, but I feel like they're missing something. I think the biggest reason for this is that "decent major leaguers" don't last as long as they used to. Once the "marginal" major leaguer hit arbitration, he's DFA'd. Ten years ago he still received a contract. Once the "decent" major leaguer hits free agency, he's now offerred a minor league deal, when you used to get a multi-year ML contract, because now the GM's realize they can get nearly the same production out of a rookie. And that rookie is getting a shot earlier, making his peak even earlier (simply becasue there is data for earlier). This is all based on my assumption that lack of data for a 34 year old (fewer 34 year olds getting ML free agent contracts) counts as a negative in these models. If removing these marginal players doesn't "count against" their age range, and just eliminates poorer performances, then I'm more wrong than you think I am. I would love to see reaserach on the aging curve of 10-year vets. I would imagine they are not much different that they were 10 years ago.