Protein by age: a practical starting range

The 30-second answer

Protein needs depend on body size, age, activity, health, and whether total energy intake is adequate. For generally healthy adults, 0.8 grams per kilogram of body weight per day is the established U.S. and Canadian baseline. Older adults and people doing regular resistance training may benefit from a higher range.

Treat these numbers as starting points, not lifespan prescriptions. Resistance training is the stimulus for strength and muscle adaptation; protein helps support that response.

Starting ranges by age and goal

These ranges describe generally healthy adults unless stated otherwise. The 0.8 g/kg baseline is an official requirement; the higher ranges come from geriatric and training evidence and should be labeled as context-specific guidance.

• Ages 19–64, generally healthy: 0.8 g/kg/day is the U.S. and Canadian Recommended Dietary Allowance.
• Ages 65 and older, generally healthy: 1.0–1.2 g/kg/day is a common geriatric expert range intended to support muscle and function. It is not a universal statutory requirement.
• Adults doing regular resistance training: about 1.2–1.6 g/kg/day is a practical evidence-informed range. Studies do not consistently show additional lean-mass benefit above roughly 1.6 g/kg/day.
• Older adults with acute or chronic illness, wounds, frailty, or malnutrition risk: 1.2–1.5 g/kg/day is sometimes used in clinical care, but it should be individualized by a qualified clinician or dietitian.

Japan's 2025 reference amounts

Japan's 2025 Dietary Reference Intakes use age- and sex-specific grams per day rather than one body-weight formula. In the official table's categories, the recommended amounts are 65 g/day for men and 50 g/day for women at ages 18–64, and 60 g/day for men and 50 g/day for women at age 65 and older.

The table also raises the protein energy target from 13–20% at ages 18–49 to 14–20% at ages 50–64 and 15–20% at age 65 and older. These population reference values should not be mixed with the higher geriatric or training ranges as though they were the same type of recommendation.

Convert a range into a daily total

Multiply body weight in kilograms by the selected range. At 60 kg, the three reference points are 48 g/day at 0.8, 60–72 g/day at 1.0–1.2, and 72–96 g/day at 1.2–1.6. At 75 kg, they are 60 g/day, 75–90 g/day, and 90–120 g/day.

Daily total and adequate energy intake matter more than perfect timing. Spread protein-containing foods across meals in a way you can sustain: legumes, tofu and other soy foods, dairy if tolerated, eggs, fish, poultry or meat if used, nuts, seeds, and grains can all contribute. Protein powder is an optional convenience, not the foundation.

When a generic calculator is not enough

Kidney disease, major liver disease, pregnancy, recent hospitalization, unintentional weight loss, frailty, swallowing difficulty, and other clinical conditions can change both the appropriate target and how body weight should be used. Seek individualized guidance instead of applying a high-protein range on your own.

No protein target or protein powder has been shown to extend human lifespan. The stronger evidence concerns dietary adequacy, muscle maintenance, and adaptation to resistance training.