Let us say we have this regression
$$\ln(y) = a + B_1(age) + B_2\ln(savings) + B_3\ln(income+1)$$
When carrying out the regression we obtain:
$$\ln(y) = 0.3445 + 0.5(age) + 0.4556 x_1 + 0.55566 x_2$$
How would one interpret the coefficients in each case? Of particular concern is the income coefficient. An increase of income of 1% would lead to an increase of how much in $y$?
This is a hypothetical example to illustrate the problem I have.