Anniversariesintermediate series

This nice puzzle is adapted from Dan Lynch’s (now possibly defunct) site “Genealogy Worldwide”. Beyond that, its origin is obscure: anyone who can shed light on it, please contact me.

On June 1st, five couples will celebrate their wedding anniversaries. Their surnames are Johnstone, Parker, Watson, Graves and Shearer. Each couple consists of a husband and a wife. The husbands’ given names are Russell, Douglas, Charles, Peter and Everett. The wives’ given names are Elaine, Joyce, Marcia, Elizabeth and Mildred.

Joyce has not been married as long as Charles or the Parkers.
Elizabeth has been married twice as long as the Watsons, but only half as long as Russell.
The Shearers have been married ten years longer than Peter and ten years less than Marcia.
Douglas and Mildred have been married for 25 years less than the Graves who, having been married for 30 years, are the couple who have been married the longest.
The Johnstones are not the couple who have been married the shortest amount of time.
Everett has been married for 25 years.

Who is married to whom, and how long have they been married?

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