Is creatinine level 2.6 in an old woman bad?

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as per your question,i want to tell you that...if the lady,concerned,is too old,then a slight increase in Creatine is normal,due to the age factor.

But,

If she a lady in her 60s,then it seems her kidney efficiency has decreased,please consult with a Nephrologist.

Creatinine should be 0.8-1.2 mg/dL for males, and 0.6-0.9 mg/dL for females. So, 2.6 would be an elevated Creatinine level. Any condition that impairs the function of the kidneys will probably raise the Creatinine level in the blood.

The most common causes of longstanding kidney disease in adults are high blood pressure and Diabetes mellitus. Certain drugs can sometimes cause abnormally elevated creatinine levels.