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for many funds, the documents only go back to 2007 even if the fund is much older (example: Ariel Fund).
That's not entirely correct. You may not be able to find them, but generally the SEC has fund docs going back to 1994 or 1995, including Ariel…
M* Fund Reports include a fund's turnover rate for the past 10 calendar years.
You may be able to access M* Fund Reports online via your public library system.
I'm not aware of any websites which provide annual turnover statistics spanning multiple …
Additionally, can fund outflows affect a fund's turnover stats?
For example, if the fund usually has 5% turnover, but then gets hit by a 20% outflow, would their turnover (if they had to sell 20% of their positions) then go to 25%?
Thanks!