Here's a common approach:
* First 2 years: 1 human year equals 10.5 dog years
* Every year after that: 1 human year equals 4 dog years
So, for someone who is 63:
* First 2 years: 2 x 10.5 = 21 dog years
* Remaining years: (63 - 2) x 4 = 244 dog years
* Total: 21 + 244 = 265 dog years
However, remember this is just a general idea. Dog aging varies by breed and size, so it's not a precise science!