if you have any english language and logical thinking skills, you'd see that the author was 2 when his brother was half of his age. When he says that now he's 100, he means that 98 years ago he was 2. 98 years ago, his brother was 1. Now, his brother is 99, 98 years later.
By "NOW i am 100" he doesn't mean "Now i'm 100, calculate that". You can see this if you think normally and don't see things in weird, unreasonably dumb ways. Do you expect the author of a dumb image spam macro to think that way? It's a very simple trick question.