In the process, her work has become a fascinating barometer of social change: when Stella first started her agency in the early Sixties, newspapers refused to carry her adverts for fear of causing a scandal.
But some things remain comfortingly constant, among them people's expectations - which are, she says, on the whole, generally unrealistic.
"Old men always want a young dolly bird, and the plainest girls still like to think they can get themselves a millionaire," says Stella waspishly.
Today, she still sports the steely, scrutinising gaze that has been her principal professional tool during her 50-year career - a career she fell into by accident to distract herself from an unhappy marriage of her own (the irony of that inconvenient fact does not, of course, escape her).
Such computers are used as control systems for a very wide variety of industrial and consumer devices.
This includes simple special purpose devices like microwave ovens and remote controls, factory devices such as industrial robots and computer assisted design, but also in general purpose devices like personal computers and mobile devices such as smartphones.
Clients paid and answered more than a hundred questions, such as whether women would prefer to "find their ideal man in a camp chopping wood, in a studio painting a canvas, or in a garage working a pillar drill." The answers were fed into an IBM 1400 Series computer, "which then spit out your matches, five blue cards, if you were a woman, or five pink ones, if you were a man." TACT eventually spread all over New York, but was well ahead of its time, given that it was suspect in a criminal investigation after the Kings County Board of Education noticed students filling out "questionable" dating surveys.
By 1825 an agency in Bishopsgate, London, opened three days a week for members of the public looking for a partner to describe themselves and subscribe to the appropriate list.
(...) The system of this curious, and it should seem actually serious, plan — as far as we can learn — is as follows: — Every person, of either sex, who desires to enter into a treaty of marriage, is first to subscribe a certain sum.
All ladies and gentlemen to describe themselves, by real or fictitious names, as they may choose". — A gentleman, 40 years of age, a little corpulent, rather of a dark brown complexion, wears a wig, has a place in the Customs, and a small estate in Suffolk, with 750l.
The Internet is run on computers and it connects millions of other computers.
Since ancient times, simple manual devices like the abacus aided people in doing calculations.