Abst0897 #ACR21 @RheumNow radiographic progression in AS accelerates w/age, highest at age 30–39 (mean mSASSS change per year 1.148), followed by 40–49 , 20–29,≥50 & least < 20 (0.643). radiographic damage rapidly ⬆️ among 20s w/risk factors:⬆️ CRP &preexisting syndesmophytes https://t.co/tiAgKUyjJq