Dear Varsha,
I believe IELTS task two question will have a line saying " Discuss the advantages and disadvantages of working beyond retirement age also give your own opinion based on your experience and knowledge" No matter even if they didn't ask about your opinion. It is always better to provide your own experience in the introduction as last point, nothing harm in that.
Then, Your ideas should be given in a academic manner rather than writing in our day to day conversation language.
For Eg:
However, there are many negatives of working longer.
---> This could be like this as per my knowledge
" However, though there are various benefits obtained through working beyond retirement age, we cannot overlooked the associated issues which it may give rise to"There are positives of working longer not only to individual but to the society and country as well.
--> Please be remember that while using
not only, you should close it with
but also . then the tense should be same at both the places.
Eg:
In general working nature of aging population not only beneficial for the individual alone, but also eventually bring positive outcomes to the society as well .
Finally, Try to support your ideas with relevant examples in paragraph 2 and 3.
Good Luck for your wirting!!!
...Arun