In March, twin sisters Louise and Martine Fokkens, 70, announced their joint retirement after more than 50 years each on the job as Amsterdam prostitutes. In February, the minimum age for prostitutes in the Netherlands was raised to 21; there's no maximum. The twins guess they had 355,000 client-visits between them, and Martine noted she still has one devoted regular whom she’ll have to disappoint. Louise, though, seems happier to hang up her mattress for good; she has arthritis. The sisters complained about the 2000 legalization of brothels, with East European women and pimps out-hustling the more genteel Dutch and ensuing taxation, which required them to take on more clients.