Anna and Jonathan are frighteningly sensible. They married last year and have their future mapped out: London for a few years, then New York, then Cape Town because, believes Jonathan, 'it's a gorgeous place to bring up kids - lots of space and a good education system'. They are 22 and 23. Just as sensible are Lex and Dave. They met at Reading University when they were 21, got engaged at 22 and now, at the grand old age of 24, have just bought their first place together. 'We wanted the commitment so we got engaged,' says Lex. Over coffee in their Cromwell Road flat, they talk about how they've achieved their perfectly planned life. Renting, they decided, was money down the drain. 'With buying, even if we choose to move, we're consistently making money,' explains Dave, a lawyer.