You should only consider taking the GRE if you think it will provide a meaningful piece of information for your application. As a point of reference, applicants prior to the Fall 2019 admissions cycle have presented median scores of 158 on the verbal section, 152 on the quantitative section, and 4.5 on the analytical writing section. Not submitting GRE scores will not negatively impact your application in any way.
GRE scores are typically valid for five years.  Please check with ETS to confirm the validity of your scores.