Since dwarves are such a traditional people, I'd like include elements of dwarven ancestry to highlight the passage of time and to tie the dwarven PCs to their people's history. I figured a simple way to do that would be to refer to dwarven generations as a rough unit of time such "One hundred generations ago". I just need to figure out the overall average amount of time between a dwarf being born and the age at which he/she is most likely to produce offspring.
Naturally dwarves can marry and produce offspring and different times in their lives. But being a generally traditional people, I imagine there is a period of life in which it is considered most appropriate to marry. There are likely outliers who marry young or old but, given enough generations, such anomalies tend to iron themselves out over time.
According to the aging charts dwarves reach young adulthood at 40, proper adulthood somewhere between 50 and 64 (depending on vocation), reach midlife at 125 and the end of their reproductive years (if they're anything like humans) maybe somewhere around 150.