Older workers have a harder time finding jobs and remain the demographic that once unemployed, stays out of work the longest. So hanging on to their jobs is of paramount importance. Yet here are seven mistakes older workers unwittingly make:

1. They don't think they need to pick up new skills while they are still employed.
Jobs are not static anymore. The workplace is constantly evolving and they need to evolve along with it. If an employer offers training classes, some older workers wrongly believe the classes are intended for new company hires and don't go. Instead, they should be taking as many of those earn-as-you-learn classes as possible.

Should they lose that job, training is hard to come by. Government training programmes are geared toward those who are receiving public assistance. The goal is to get those folks off the public dole and into tax-generating jobs.

Retraining programmes for college-educated professionals kind of don't exist. That, or they do a terrific job of hiding themselves from the public. In fact, a "60 Minutes" segment featured a Connecticut programme in 2012 for just one reason: It was such a rarity. In that programme, college-educated professionals, who had lost their jobs when they were in their 40s or 50s and who had been out of work for a full 99 weeks, were given a crack at some internships that could lead to permanent jobs. These former six-figure earners were grateful for the foot in the door for one big reason: Most of their peers don't even get that.

2. They think community colleges are just for kids.
The community college system has borne the brunt of re-training the displaced older workforce. There's a programme that launched in 2010 called the Plus 50 Completion Strategy which basically helps post 50 students complete their post-secondary degrees, and aims to give older workers the skills they need to get jobs in fields that are actually hiring -- like health care. So far, the Plus 50 initiative has served about 24,000 students, which -- not to diminish this rare drop in the bucket -- is about how many out-of-work journalists I hear from in any given week.

Even if you are working, it still makes sense to keep an eye on what lies around the corner for you professionally. Many of these classes can be taken online. If you are in one of those careers that is contracting, use the "hospice time" to prepare for what you will be doing next. And a community college is a great place to start.

3. They don't sufficiently value reverse mentoring.
Older employees have some amazing teachers right under their noses, says Robert L. Dilenschneider, an author and business leader who lectures older workers around the country about staying relevant. "Younger employees are fluent not just in the new technologies but in the best ways to deliver business messages and marketing in such technologies," he said, and older workers should seek them out. When workers can learn from each other, the workplace is strengthened.

Mentoring is a two-way street and the older workers who embrace that -- instead of thinking that their age and experience alone make them the only teachers in the room -- improve their value to the company.

4. They wrongly assume that working beyond 66 will be their choice.
This is a silly assumption, especially with companies eager to reduce costs and an economy that can provide many eager-to-work millennials who can be paid less than an older, more-experienced worker. The reality is that there is a guillotine lurking in every future and no job is secure for a lifetime anymore. It's another argument for making yourself as invaluable as possible to the company by being willing and able to do multiple tasks.

Most boomers have gotten over the notion that they will be able to retire as young as their parents did. Now the goal is to hang on to the jobs they have for as long as possible.

5. They inflict self-damage when they joke about being tech-illiterate.
Stereotypes are bad things. And one of the popular stereotypes is that older people resist technology. It hurts them in the workplace and can be the death knell if they are job-hunting. And never mind that it isn't a universal truth.

It's important not to fuel the myth. Telling your younger boss that you need your teenager to programme your new phone isn't a funny joke; it's a check mark in your "not capable" column.

6. They don't make time to socialise with the younger people in the office.
While you may not think you have oodles in common with your decades-younger coworkers, it's important to secure your place in the office universe.

Go out to lunch when they invite you, make time for the occasional drink after work, be interested in their weekend plans. Aside from the fact that having office friends will actually make coming to work more fun, it's also easier to lay off the people who nobody knows.

7. They don't actually have an exit strategy or a retirement plan.
A Fidelity study reported that 48 percent of boomers won't be able to afford basic expenses in retirement. It begs the question: What are you doing about it?

The simplest answer is to try and save more and look for ways you are wasting money now. Another thing to think about is your housing costs, which are pretty much everyone's big ticket item. While you are still working is the perfect time to look into more affordable places to live or how you can adapt your home expenses to be more aligned with your reduced retirement income.