It has been suggested to use "moving averages" for individual Profiles. E.g., "Slender" morphing into "Athletic" morphing into "A few extra pounds" over time. Or services expanding or contracting over time.  
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http://www.theeroticreview.com/discussion-boards/suggestion-and-policy-4/need-editable-data-fields-15870
http://www.theeroticreview.com/discussion-boards/suggestion-and-policy-4/agree-new-data-should-be-cumulative-15408
http://www.theeroticreview.com/discussion-boards/suggestion-and-policy-4/no-no-noooooo-14301
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Your suggestion applies to the Top lists. I'd like to maintain access to historical info for use in forum discussions. "Do you remember that guy from 2003? He's still on the Top list. Try to beat THAT!" Your suggestion does not rule that out. I wonder if TER has the programming ability to make a slider of some sort, so the user can set a window on the timeline:
2000^....................................................................^present | All years
2000.................................^...................................^present | -5 years to present
2000.................................^..............^.....................present | -5 years to -3 years
OR your suggestion just to enter dates in data field on a form (manual version of a slider).  Either way, or any other way, I think the main block is the programming ability on the TER side. The databases are kind of old and have gone through incremental changes over time. Any new feature runs the risk of breaking the whole thing.