How do relationships change with age? Might Sternberg's triangular theory of love differ between an 18-year-old couple and a 50-year-old couple?

How do relationships change with age? Might Sternberg's triangular theory of love differ between an 18-year-old couple and a 50-year-old couple? Provide examples.

Based on the literature, list six key factors that contribute to healthy relationship dynamics.