
Infirmity
Age Association
Often linked with older age; isn't used much for young people unless they're severely ill.

Grandmother's growing infirmity has made stairs difficult for her.
Physical Context
Mainly refers to physical strength, not mental capabilities or emotional states.

His infirmity since the accident has made it hard to lift objects.
Not Disability
Infirmity suggests a condition that can improve, unlike a permanent disability.

Her infirmity was temporary, and with therapy, she began to recover.
Compare with
AilmentDebilityDefectDisabilityDisorderFrailtyIllMaladyWeak
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