For a pensioner I think the best business will be to open a shop to sell provisions, clothes, and food stuffs that is for offline business but he can also be involved in online businesses that pays well.
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Yes,that is very true,because when you want to go into any venture especially after retireement,you will need to know the business you wnt to go into,and plan towards acheiving success for that business.I also feel that planning is like the most important factor because when you plan, other step would be easy all that would be required next is taking actions on the said plans.
There are various business that a retiree can go into,he can decide to be in the same line of business that he was doing before retirement,and then he can decide to go into consulting.There are a lot of business a pensioner can venture into in today's world. Many of them see their age as a disadvantage to do a particular business but that shouldn't be the case. But they can still learn some skills.