The way people spend time determines the quality of their lives. Work takes a significant share of the time we have at our disposal. The allocation of time between paid and unpaid work depends on gender as well as age, and it influences women's and men's opportunities. This chapter analyses the allocation of women's and men's time between paid and unpaid work in the context of life-cycle. In the first part, economic theories concerning decision making processes about how to allocate time between market work and household are presented. The allocation of women's and men's time in distinguished age groups in Poland is analysed in the second part of the chapter. The analysis is based on time use data from research conducted by Central Statistical Office in years 2003-2004. The last part presents the logistic function that allows to determine estimated maxima of women's and men's activities both in paid and unpaid work. The analysis confirmed that time allocation depends both on gender and life-cycle.