Originally Posted by
Sweet Willie
approx age?
From my anecdotal evidence when I used to tend bar, younger (mostly men) would order Jack & some sort of soda, friends of mine included. As they got older, most dropped the soda and simply asked for the booze

Bingo. Early 20s.
I must confess I've been tempted to dump some Johnny Walker Blue into orange juice while in the BA First Lounge at LHR just to see the reaction of the people around.