The formula to calculate the human equivalent age (H) is:
\[ H = (h \times 2.5) + 2 \]
Where:
Let's say the horse age is 10 years. Using the formula:
\[ H = (10 \times 2.5) + 2 \]
We get:
\[ H = 27 \]
So, the human equivalent age (\( H \)) is 27 years.