How geolocially old are the Aleutian Islands west of America?

Question

Could they be as ancient as America itself or did they came a bit later from volcanic eruptions?

Answer 1

http://www.fs.fed.us/land/pubs/ecoregions/ch7.html#M127B
The Aleutian Islands are part of a volcanic island arc.
The older rocks are Tertiary. Lots of the continent of North America is many millions of years older.

Lithology and Stratigraphy. The linear chain of volcanoes on the north side of the islands is of late Cenozoic age and includes many calderas. The remainder of the islands appear to be emerged parts of tilted fault blocks, consisting chiefly of faulted and folded Cenozoic volcanic rocks, which include locally mildly metamorphosed as well as granitic intrusions of Cenozoic age. The submarine topography of the Aleutian Ridge reveals to be complexly block faulted along its crest.

Answer 2

The Aleutians are volcanic.