Of course, you can not quit, not thinking about the future. It is desirable to find a new job, has not yet left the old to go away quietly. It also makes sense to save money to live peacefully the first months after the dismissal, or open their own business and work for themselves, rather than a stranger.
Advance warning of his boss that you plan to retire. He will need time to find you a replacement, in addition, you will still have to work for a while before you leave. The standard period of notice of dismissal before the actual departure from work is 2 weeks. However, you may be asked to stay for 3-4 weeks, especially if you are having difficulty finding a new employee.
Be firm in your decision. People often for years and decades working for the hated work, not daring to throw it out of fear of being unnecessary. This fear certainly will fuel your friends and relatives. Resist pressure from the family is very difficult, but you need to gather your strength and withstanding the test. Your future depends entirely on you, if you are confident in the correctness of its decision, do not succumb to provocation and do what you see fit.