It's kind of hard to separate age out as values start out low, peak, and then decrease towards the end of the career.
So, I'm going to tackle this two ways.
First to look at where each player stands today in career win shares relative to their draft class.
Bass (13)
Bradley (23)
Crowder (16)
Olynyk (5)
Pressey (not drafted. His WS place him around 32)
Prince (5)
Smart (2)
Sullinger (5)
Thornton (16)
Turner (16)
Wallace (8.)
Young (19)
Zeller (9)
The issues with this method is that the WS rank of young players is heavily influenced by opportunity. Those who have remained healthy and had a chance to play get an early advantage on those getting a "redshirt year" or got hurt early. Also, older players such as Prince and Wallace are being compared to a list that has an increasing number of players who are no longer in the league.
The second way is to look at past drafts and see what type of player on average you can expect at a certain slot. There are hits and misses everywhere but on average. These are my rough categories
.
1-2 all stars-superstars
3-5 other foundation pieces (can be your #3)
6-10 other starters
11-15 can be part of a top 8 shortened rotation
16-20 other second-teamers
21-25 Deep Bench
26+ players just taking up a roster spot
So, with these categories, I would place them in (and again, this includes my opinion on a players current role capability. Just because a player is starting on this team doesn't necessarily mean I view them as a starter and just because a player is coming off the bench, doesn't necessarily mean I view them as a bench player. Young players like Smart and Young will be undervalued here because they aren't ready for a bigger role). Anything above 25 I'm just going to consider undrafted.
Bass (16-20)
Bradley (16-20)
Crowder (16-20)
Olynyk (11-15)
Pressey (undrafted)
Prince (undrafted)
Smart (6-10)
Sullinger (6-10)
Thornton (16-20)
Turner (11-15)
Wallace (undrafted)
Young (21-25)
Zeller (16-20)
Again, these are looking at current values not where I would draft them now. This would be in a yearly redraft where there is no future beyond this season.