If you don’t negotiate a job offer you could be leaving money on the table.

The website CareerBuilder conducted a survey of almost 3,000 private sector U.S. workers and more than 2,000 hiring managers and human resource professionals.

When it comes to who is most likely to negotiate, age is a factor. 

Experience is a factor,” CareerBuilder Senior Career Advisor Ryan Hunt told KTRH News. “Fifty-five percent of workers 35 or older are more inclined to negotiate, as opposed to 18-35 year olds.”

Gender plays a slight role.  Men (54%) are more likely than women (49%) to negotiate first offers.

“Hiring managers are sometime locked down to a salary range, but sometimes if they can’t give you that extra 3% on your salary they’ll be able to give you extra perks, and a lot of job-seekers aren’t aware of that,” Hunt continued.  “Flexible schedules, which is a big premium and much in demand in the marketplace right now.  Often times they’ll give you extra vacation days, or allow you to telecommute at least once a week, if the job allows.”

38% of employers say they would not be able to provide anything.