On 9 September 2007 the Netherlands Demographic Society (NVD) hosted the 2nd Dutch Demography Day. The day started with a plenary session on the consequences of population ageing by drs. Jolande Sap, director of Expertisecentrum LEEFtijd. The NIDI thesis award was awarded to Martijn Hogerbrugge for his thesis ‘The family ties of unmarried cohabiting persons’.