For plotting Wage vs. Age, see anonymous functions ('@'). You can define the range for your age and using the coeficients you found along with your other fixed values, you can get estimated wages.
As for confidence intervals, this is way more tricky. Do you have the stats toolbox? The function regress() may help but you are going to have to take some liberties and make some assumptions. Your confidence around age would be better if your data is focused on fixing the other variables.
So depending on how you got your data and how you fit your parametric model will determine how well your confidence is in your estimates.
