Essay practice of for 6th May

I'm a student who is learning the arts, however, I need to develop my writing skills more. Therefore, I am going to write an essay everyday for writing practice!

Today's topic: A job should mean a job for life. Do you agree or disagree? Use specific reasons and examples to support your answer.

Some people may argue that people should have a job for life, however, I have a different idea. In my opinion, people can have several jobs for over their lives. The reason is as in the follows;

First of all, because of medical development, the average span of human life span age is much more expanded than before. Nevertheless, many companies ask them  people to retire at around 65. Of course, in the past, 65 the age was gave people enough time to prepare for their old age, but, the elderlys in nowadays can't do that. Unlike in the past, the expanding average age span of age, enables senior citizens can to live 20 years more. In other words, If they retire at 65 years old, they would live on for approx.20 healthy years healthy.For example, Laura is an employee crew of Tim horton's where I (my favourite), she is 68 years old. When she was young, she taught students french. Although retired, she is still healthy. So she works at Tim Horton's as part time, worker and is satisfied with  her the second job.
Second, many jobs occur appear and disappear in our society because times are changing. For example, computer programmer is a job that appeared recently. 100 years ago, people might ignorance would have not known about that job. On the Contrary to this, for example, my grandmother was a telephone operator. A telephone operator is a job to where you accept a call from a customer and redirect  it to another customer. That was famous well known job, however, while communication technology developeding, and automatic telephone connection automatically each other was invented. Therefore, many people didn't  doesn't need telephone operators anymore. So Then, how what about the telephone operators who losing jobs? They should would have needed to find other jobs and adapted them quickly. other job soon.
In conclusion, people could choose a job for their whole life, however, as the human life span age is much expanded longer than before, period and many jobs have changed because of technological developments of technology. Therefore, I think people has need to have several jobs in over their whole life.