A man was born 1976 and he dies 1977 . when he dies he was 86 years old how is that possible?

I suggest that you seek proper religious instruction. God was not born 20000 years ago. God is for all eternity and created the heaven and the earth. HE was not born but always existed. If you really want to know about the creation of the earth and how old it is likely to be then start reading National Geographics magazines

Make sure you check your belts and hoses and top off all fluid levels before undertaking any trip.

He was 76 yrs 1 month when he died

269 years.

John Doe is the name given to any man whose name is not known. You could be talking about different Does.

Let x be Diophantus' age when he died.

His son died 4 years before Diophantus (so Diophantus was then x-4 years old). His son lived half as long as Diophantus so when he (son) died he was x/2.
Diophantus' son was born when Diophantus was (x-4)-x/2 years old. That was 5 years after his marriage so when Diophantus married he was (x-4)-x/2-5 years old. We also know that 1/6 of his life was spent in childhood, 1/12 in youth and 1/7 as bachelor so (x-4)-x/2-5=(1/6+1/12+1/7)x.
Now you solve last equation:

• x-4-x/2-5=11/28x
• x/2-11/28x=4+5
• 3/28x=9
• x=9*28/3=84 years

Diophantus was 84 years old when he died.

They would be born in the year 1984 if their birthday is before today's month and day, but if their birthday is later in the year, it would be 1983.

why correct her? that just cute she will learn it eventually...

make her count backwards starting with the current year,
a new born baby born today is how old?
what if that baby was born last year?
the year before?

it will click