The study examined perceived similarity and understanding in dyadic coping among 197 young and 192 mature couples. Perceived similarity and understanding were computed through a dyad-centered approach. To separate 2 equally important components of dyadic congruence (i.e., unique and stereotypical similarity) stereotype adjusted and unadjusted scores were computed. Results indicated that stereotype effects were higher among young couples than among mature couples; perceived stereotypical similarity was higher in young couples than in mature couples and stereotypical and partner-specific understanding were higher in mature couple relationships. Stereotypical understanding was positively associated with relationship quality but only among mature couples. Partner-specific understanding was not associated with relationship quality in mature couples, but it was negatively associated with relationship quality in young couples. © 2011 IARR.