Dog Age worksheet

1. Human-equivalent age: 59.7 years

1. Take the natural log (ln) of the age, a button on most calculators that grows fast early, then slows

   $\text{ln}6$$=1.791759$

2. Multiply by 16 and add 31, the numbers researchers found by studying Labrador retrievers

   $16\times 1.791759+31$$=59.668152\text{\hspace{0.17em}human years}$

2. Human-equivalent age: 60 years

1. The first two years count as 15 + 9 = 24 human years

   $15+9$$=24\text{\hspace{0.17em}human years}$

2. Every year after the second adds 6 human years

   $24+6\times \left(8-2\right)$$=60\text{\hspace{0.17em}human years}$

3. Human-equivalent age: 36 years

1. The first two years count as 15 + 9 = 24 human years

   $15+9$$=24\text{\hspace{0.17em}human years}$

2. Every year after the second adds 4 human years

   $24+4\times \left(5-2\right)$$=36\text{\hspace{0.17em}human years}$

4. Human-equivalent age: 39 years

1. The first two years count as 15 + 9 = 24 human years

   $15+9$$=24\text{\hspace{0.17em}human years}$

2. Every year after the second adds 5 human years

   $24+5\times \left(5-2\right)$$=39\text{\hspace{0.17em}human years}$

5. Human-equivalent age: 48 years

1. The first two years count as 15 + 9 = 24 human years

   $15+9$$=24\text{\hspace{0.17em}human years}$

2. Every year after the second adds 6 human years

   $24+6\times \left(6-2\right)$$=48\text{\hspace{0.17em}human years}$

6. Human-equivalent age: 62.1 years

1. Take the natural log (ln) of the age, a button on most calculators that grows fast early, then slows

   $\text{ln}7$$=1.94591$

2. Multiply by 16 and add 31, the numbers researchers found by studying Labrador retrievers

   $16\times 1.94591+31$$=62.134562\text{\hspace{0.17em}human years}$

7. Human-equivalent age: 44 years

1. The first two years count as 15 + 9 = 24 human years

   $15+9$$=24\text{\hspace{0.17em}human years}$

2. Every year after the second adds 5 human years

   $24+5\times \left(6-2\right)$$=44\text{\hspace{0.17em}human years}$

8. Human-equivalent age: 64.3 years

1. Take the natural log (ln) of the age, a button on most calculators that grows fast early, then slows

   $\text{ln}8$$=2.079442$

2. Multiply by 16 and add 31, the numbers researchers found by studying Labrador retrievers

   $16\times 2.079442+31$$=64.271065\text{\hspace{0.17em}human years}$

9. Human-equivalent age: 56.8 years

1. Take the natural log (ln) of the age, a button on most calculators that grows fast early, then slows

   $\text{ln}5$$=1.609438$

2. Multiply by 16 and add 31, the numbers researchers found by studying Labrador retrievers

   $16\times 1.609438+31$$=56.751007\text{\hspace{0.17em}human years}$

10. Human-equivalent age: 40 years

1. The first two years count as 15 + 9 = 24 human years

   $15+9$$=24\text{\hspace{0.17em}human years}$

2. Every year after the second adds 4 human years

   $24+4\times \left(6-2\right)$$=40\text{\hspace{0.17em}human years}$