It is kind of a finance problem, at least i think it is similar to depreciation calculations:

So here goes:

Given a 100 year lifespan target; rate of decline of muscle strength between 50-65yo at 10% per year; rate of decline of muscle strength after 65yo at 1-2% per year; a minimum hip extensor muscle strength of 1.7N/kg for independent living; 65kg average male weight at 100 years old.

What is the starting strength needed at 50yo for the average male? Express it N/Kg

So, I thought to convert 1.7N/kg*65=110.5N force needed at 100 yo to be independent.
Then, 'depreciate the unkn

Question

It is kind of a finance problem, at least i think it is similar to depreciation calculations:

So here goes:

Given a 100 year lifespan target; rate of decline of muscle strength between 50-65yo at 10% per year; rate of decline of muscle strength after 65yo at 1-2% per year; a minimum hip extensor muscle strength of 1.7N/kg for independent living;  65kg average male weight at 100 years old.

What is the starting strength needed at 50yo for the average male? Express it N/Kg 

So, I thought to convert 1.7N/kg*65=110.5N force needed at 100 yo to be independent.
Then, 'depreciate the unkn