Here's a look at what causes hair to turn gray and some of the factors that affect graying. Answer: The age at which you'll get your first gray hair (assuming your hair doesn't simply fall out) is largely determined by genetics.
Profits or net income generally imply total revenue minus total expenses in a given period. In accounting, revenue is often referred to as the top line due to its position on the income statement at the very top. This is to be contrasted with the bottom line which denotes net income.
Two important parts of this method of accounting are accrued expenses and accrued revenues. Accrued expenses are expenses that are incurred in one accounting period but won't be paid until another. Primary examples of accrued expenses are salaries payable and interest payable.