What is the average age that couples in UK cohabit?

The average age that couples in the UK cohabit is 30.4 years. This figure has been steadily rising over the past few decades, and is now nearly 10 years higher than it was in the 1970s. There are a number of factors that have contributed to this increase, including the rising cost of housing, the increasing number of women in the workforce, and the changing social attitudes towards cohabitation.