A man dies of old age on his 25 birthday. How is this possible?

There was a strange boy who was born before his father. How can this be possible?

John, a 5-year-old boy, was really fond of the chocolates. He asked his Mother to give him some money to buy his favourite chocolates. His Mother gave him $45. He went to the shopkeeper and asked, "How much is one chocolate for?". The shopkeeper said $3 for one chocolate. Also, if you give me the wrappers of three chocolates, I will give you one for the exchange.
In total, how much chocolate could John eat?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

What has no start, end, or centre?

No matter how little or how much you use me, you change me every month. What am I?

The captain of a ship is telling you an interesting story and then poses a question. He says, “I have travelled the oceans far and wide. One time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. Can you tell me how that was possible?”

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?