A cat ages fastest in year one, hits roughly 24 human years by its second birthday, then adds about four human years for every year after that. This cat age calculator uses that milestone-based scale instead of a flat multiplier.
Cat Age Calculator
Indoor cats commonly live into their high teens, so a cat that reads as “senior” on this calculator still has years ahead of it with the right setup. The cat trees guide and litter box guide both flag which picks suit an older, less agile cat.
Gunner Vance