The age of the dog

The age of the dog "pet trivia"

What about what the human equivalent to the old age of the dog, there are many theories.
It is said that in general, one year of age averaged 20 days a year old.
In other words, 18 year old man. Is that it takes four years older each year thereafter.
Looking at the table with them, so it looks like the following, please refer to

Dog man
1 year 1 month
3 years 2 months
9 years 6 months
18 years 12 months
22 years old 2
26 years old 3 years
4 years 30 years
34 years 5 years
54 years 10 years
74 years 15 years
96 years 20 years