According to analysis of the Displaced Workers Survey, in 2004 workers age 25-29 had a 4% probability of being displaced.  In comparison, the probability was 4.2% for ages 30-34, 2.9% for ages 35-39, 2.5% for ages 40-44, 2.2% for ages 45-54, 3% for ages 55-59, and 3.5% for ages 60-64. (Table 5, p. 25)

Munnell, A. H., Sass, S., Soto, M., & Zhivan, N. (2006).  Has the disaplcement of older workers increased? (Working Paper No. 17).  Chestnut Hill, MA: Center for Retirement Research at Boston College.  Retrieved from http://crr.bc.edu/images/stories/Working_Papers/wp_2006-17.pdf

This paper "explores the relationship between job loss and age over the period 1984-2004 using the biennial Displaced Worker Supplement to the Current Population Survey.  "The survey attempts to measure the incidence of job loss due to a shift in labor demand by asking workers whether they have been displaced for one of the following reasons: 1. their plant or company closed down or moved; 2. their company had insufficient work; 3. their position or shift was abolished; 4. a seasonal job was completed; 5. a self-operated business failed; 6. other reason."