Very interesting stats from Gallup:

Two important changes are apparent. One is a significant drop in the percentage of seniors saying all abortions should be illegal. This fell from 32% in the earliest years of the trend to 16% in the first half of the 1990s, but has since rebounded somewhat to 21%. This long-term 11-point decline among seniors compares with a 9-point increase—from 14% to 23%—in support for the “illegal in all circumstances” position among 18- to 29-year-olds since the early 1990s.

As a result, 18- to 29-year-olds are now roughly tied with seniors as the most likely of all age groups to hold this position on abortion—although all four groups are fairly close in their views. This is a sharp change from the late 1970s, when seniors were substantially more likely than younger age groups to want abortion to be illegal.