Formatting cell color if date in the cell is old

[SandsB]

I have a column of dates, column C. If the date in C2, C3, C4, etc. is more than 6 moths old I want the cell to have a white, bold font and a red background. I've tried mucking around with conditional formatting but no luck.

 

[SandsB]

My bad. I though not specifying a format would do it. I need to actually specify a format with a regular font and white background. Thank you so much.