Adults agreeing to participate willingly.

Older adults, typically over sixty.

Hardening of skin in adults.

Slowly evolving immune-mediated diabetes, or latent autoimmune diabetes in adults, is a form of diabetes that exhibits clinical features similar to both type 1 diabetes and type 2 diabetes, and is sometimes referred to as type 1.5 diabetes.

In psychology, the theory of attachment can be applied to adult relationships including friendships, emotional affairs, adult romantic and carnal relationships and, in some cases, relationships with inanimate objects ("transitional objects").

a 2019 French-Greek political film directed by Costa-Gavras.