| Sumario: | This study aimed to investigate the relationship between age and base rates of failure (BR) on various performance validity tests (PVTs) administered in medical–legal settings. Archival data were analyzed from 3,297 adults (M = 42.3 years; M = 11.2) referred for psychological or neuropsychological assessments in a medical–legal or forensic civil disability context who passed the Word Memory Test. BR on 10 PVTs (three freestanding and seven embedded) were reported at multiple cutoffs across five age groups ranging from 16 years to 69 years. BR increased with age on most embedded PVTs, with a couple of notable exceptions. Reliable Digit Span was unrelated to age at ≤6 but produced elevated BR among older examinees at ≤7. Within freestanding PVTs, a positive relationship emerged between age and BR on most instruments/cutoffs. Older age is associated with an increased risk of false positive errors on many embedded PVTs that rely on raw scores. Although freestanding PVTs tend to be more resistant to the effects of age, several commonly used cutoffs may still produce increased false positive rates in older examinees. Taken together, results suggest that PVT scores should be interpreted in the context of patient characteristics, in an evidence-based manner, rather than by rigidly applying omnibus cutoffs. Public Significance Statement: Older adults are at a higher risk for being misclassified as demonstrating invalid performance on certain instruments designed to detect noncredible responding. However, strategically selecting the tests and cutoffs can effectively mitigate this risk.
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