in 1600 the average age at first marriage was about 28 (for men) and 25-26 (for women). It fell steadily over the next two centuries, though by the 1830s it was still as high as 25-26 (men) and 24 (women).
(Incidentally, this drop in the age at which people married was a major factor in the population explosion of the 18C and 19C, since it meant that most women were married for slightly longer and therefore bore one or two more children. Another was the increasing proportion of women who married - in the 16th and 17th century as many as a quarter never married, but by the 19th century the proportion marrying had risen, thus further increasing the number of births).