How to Determine the Equation of a Curved Line of Best Fit?

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To determine the equation of a curved line of best fit for the provided age and mass data, an exponential fit is suggested as a close approximation. Plotting the natural logarithm of mass against age reveals a linear relationship, indicating that a logarithmic transformation may simplify the analysis. This approach allows for easier calculation of the best fit curve. The data suggests a trend where mass increases with age, reflecting typical growth patterns. Utilizing these methods will help accurately model the relationship between age and mass.
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I really need help. I will try my best to post this chart.

Age/Mass
5/ 24
6 / 25
7 / 27
8 / 28
9 / 31
10 /34
11 /38
12 /41
13 /47
14 /55
The slashes are there to separate the numbers and columns

How would you determine the equation of the line of best fit through these points. Its a curve by the way.
 
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An exponential fit seems rather close to me. Plot the natural log of the mass versus the age. It more or less conforms to a linear relationship. One would expect that a young boy may sometimes indulges!
 

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