Apparently you can be the 49 and under world gravel champion.
or you can be the 50 and over world gravel champion.
or single speed world gravel champion.
or Tandem world gravel champion.
or Fatbike/Cargo bike/recumbent world gravel champion.
or Privateer world gravel champion.

But as is the usual case with cycling (a sport perfect for older athletes), no age-group champions will be named.

http://www.gravel-worlds.com/

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Geoff from Indy
http://www.tlcendurance.com