Normal, healthy blood creatinine levels for men generally range between approximately 0.6 to 1.2 milligrams per deciliter and between 0.5 to 1.1 milligrams per deciliter in women, notes MedicineNet. Creatinine levels generally decrease with age, so senior adults may have less creatinine in their blood as muscle activity decreases.
A normal creatinine level for babies is typically about 0.2 milligrams per deciliter, according to their muscle development and activity, states MedicineNet. Young or middle-aged adults who are muscular may have higher levels of creatinine, which is normal for them. A creatinine level of about 1.8 or 1.9 milligrams per deciliter may be normal for an individual who has only one kidney.