Oh my God now I make this even more easy for you people to understand.
1) some one who is 24 years old
Last 10 years for him stops at 14 years of age
Since age of 18 stops at 18 years of age
What comes first in 14 and 18. Obviously 14 so he will provide history since age of 14
2) Some one who is 29 years old
Last 10 years for him stop at 19 years of age
Since age of 18 stops at 18 years of age
what comes first in 18 and 19. Obviously 18 so he will provide history since age of 18.
3) some one who is 28 years old
Last 10 years for him stop at 18 years of age
Since age of 18 also stops at 18 years of age
so in any case he will provide history since age of 18
Hope it clears doubts if some body still has
Lolz..........I am teaching mathematics here but I love it and mathematics used to be my favourite subject in school....