Are there higher risks with breast reduction surgery if you have dense breast tissue?

It doesn't seem that breast density would in any way make breast reduction more complicated. On the contrary, one could expect a longer lasting result and less sagging in time when dealing with dense breasts. In person consultation with a board certified plastic surgeon with good reputation in breast surgery is recommended. Good luck.

Density of breast tissue and age will have no significant effect on your healing or result, assuming your are otherwise healthy.