Every year since 1998 I've been keeping track of team's "core ages", which I classify as their keeper list plus 
their 1st or 1st & 2nd round picks.  Below is this year's edition, also showing the last 3 years and from 2010.

Logan's Run (a reference their team won't get because they're too young to remember) still applies to the Pig's Eye 
Pirates, who have managed 2 straight pennants while still maintaining the youngest core for the past 4 years.  
The rebuilding Olympia Rainiers made the biggest youth movement, shaving almost 4 years off their average and 
jumped up 18 spots to have the 2nd youngest team.  The Termites continue to make no bones about relying on veterans, 
as their average age of 31.6 is the oldest team core in recent memory.

Team                  2010    Rank    2013    Rank    2014    Rank    2015    Rank    2016    Rank  YearJump
Pirates               28.7     15     24.5      1     24.4      1     25.4      1     25.3      1      0
Rainiers              28.7     13     28.3     13     29.3     20     29.1     20     25.3      2     18
Mangos                26.1      3     26.9      5     28.8     17     27.3     11     26.5      3      8
Syndicate             26.3      4     26.1      2     26.5      5     26.5      3     26.5      4     -1
AngryCandy            29.4     18     27.1     10     26.4      3     27.1      7     26.6      5      2
FightinOglethorpes    28.4     11     29.1     18     28.7     16     27.6     13     26.7      6      7
Rock                  25.8      2     26.8      4     27.7      9     26.5      5     27.1      7     -2
Pitbulls              25.4      1     27.2     11     27.9     11     28.4     17     27.2      8      9
Sluggers              29.1     17     27.0      8     26.3      2     26.9      6     27.3      9     -3
Arthropods            26.5      5     27.9     12     26.4      4     27.3      9     27.4     10     -1
Walruses              27.9     10     28.5     15     28.5     13     27.2      8     27.4     11     -3
Thunder               26.7      7     27.1      9     26.8      6     26.4      2     27.5     12    -10
Climbers              29.6     20     29.5     21     28.0     12     28.7     18     27.7     13      5
Pioneers              27.7      9     26.5      3     27.5      8     26.5      4     27.7     14    -10
Moshers               28.8     16     26.9      6     26.9      7     27.8     15     27.9     15      0
Coneheads             26.6      6     28.5     14     27.8     10     27.3     10     28.3     16     -6
Malice                29.6     21     29.3     19     28.6     15     29.0     19     28.4     17      2
Zeros                 27.5      8     26.9      7     28.8     18     27.5     12     28.4     18     -6
MooseDogs             31.1     23     29.5     22     28.8     19     27.7     14     28.6     19     -5
Brouhaha              29.4     19     31.4     24     30.5     23     29.8     22     29.0     20      2
'Topes                30.7     22     28.9     17     29.8     22     28.3     16     29.2     21     -5
Piazza's              28.7     14     29.5     23     29.4     21     30.2     23     30.6     22      1
Organization          28.5     12     29.4     20     31.4     24     29.6     21     30.9     23     -2
Termites              31.3     24     28.7     16     28.6     14     30.5     24     31.6     24      0