If you leave or lose your job or retire, you could lose your life insurance coverage and have no protection which is why you should have an individual life insurance policy outside of your employer. Insurance is based on two main factors, your age and your health. So, if you wait until you don't have your employers' coverage you could be older which will cost you more money and/or your health may have decline which could place you in a "rated" status or worse, you could be decline. You are the youngest and healthiest you will be, so the best time is now to take advantage of your age and health.