10/16/2026
Body weight is only one part of an older cat’s health picture. A 2025 longitudinal study followed 209 cats aged 6.7 to 16.4 years for up to seven years.
Researchers recorded 1,231 veterinary examinations overall; muscle scores were available for 208 cats across 1,144 exams. In the group averages, muscle condition began to decline before body weight did, with a steeper decline after age 10.
Individual cats can differ, and the study does not predict what is happening in a particular pet. A veterinary team can assess weight, body condition and muscle condition separately.
If you have noticed a change in your cat’s shape, bring it up with your veterinary team.
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