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"Older Lads" is a term used in The Professionals fandom to cover a wide range of stories in which the characters from the series are portrayed as older men. These characters can be from the original series and/or from the variety of roles portrayed by the original series' actors of Martin Shaw and Lewis Collins. Any combination is possible.
There is a short list of "older lads" stories on Ray Doyle's page.
A more comprehensive list, including both online and offline stories, is posted here.
The Starsky & Hutch fandom uses the term "older boys" in the same way.