When doesn't begin a relative clause, so when they were both 26 is neither restrictive nor non-restrictive. The comma is optional, but as the clause it begins is very short, I would leave the comma out. CB
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JJDouglasin 2009, when they were both 26.No comma. Subordinate clauses after the main clause are not set off by commas. A comma comes into the picture only if the subordinate clause comes before the main clause.
fivejedjonA comma is acceptable in BrE.You're talking about the OP's example, I suppose? Or my two sentences? Or both?
JJDouglasI think my confusion comes from the fact that it's a subordinate clause after a non-restrictive clause.
Cool BreezeHe is now happily married to Emily is a main clause and consequently neither restrictive nor non-restrictive.I understand that. I'm talking about "whom he married in 2009". That's a non-restrictive clause, right?