While some appeared hardened and weathered, a few appeared to be in their teens.
From the telegraph.co.uk
The fibers need to be woven into sheets and then hardened, typically with resin.
From the sfgate.com
The American President's words may have only hardened the resolve on both sides.
From the time.com
Attitudes to student-teacher relationships have hardened over the past 15 years.
From the independent.co.uk
He's hardened enough to know dancing in the backfield doesn't make plays happen.
From the sfgate.com
I put a little on some soft paper towels, and the hardened stuff came right off.
From the sacbee.com
By the time she was 20, both her mitral valve and her aortic valve had hardened.
From the sciencedaily.com
The paint hadn't hardened, and the brushes were as if I hadn't left them at all.
From the dailyherald.com
Inarguably, those emotions have hardened in the two years since Obama's victory.
From the independent.co.uk
More examples
Case-hardened: used of persons; emotionally hardened; "faced a case-hardened judge"
Tempered: made hard or flexible or resilient especially by heat treatment; "a sword of tempered steel"; "tempered glass"
Protected against attack (especially by nuclear weapons); "hardened missile silos"
Enured: made tough by habitual exposure; "hardened fishermen"; "a peasant, dark, lean-faced, wind-inured"- Robert Lynd; "our successors...may be graver, more inured and equable men"- V.S.Pritchett
Converted to solid form (as concrete)
Abnormal hardening or thickening of tissue
(Hardening (botany)) Hardening in botany is the process by which an individual plant becomes tolerant to the effects of freezing during a period of weeks to months. It is a three stage process. ...
(Hardening (computing)) In computing, hardening is usually the process of securing a system by reducing its surface of vulnerability. A system has a larger vulnerability surface the more that it does; in principle a single-function system is more secure than a multipurpose one. ...
(Hardening (metallurgy)) Hardening is a metallurgical and metalworking process used to increase the hardness of a metal. The hardness of a metal is directly proportional to the uniaxial yield stress at the location of the imposed strain. ...