Yes he does, they are really into each other, it's apparent in episode 39 and onward in the subbed version.
No, they don't. In the last episode it appears that Aki is going to confess to Yuusei, but nothing happens.
Yuusei is 18.
Yuusei's parents lost their lives in the Zero Reverse Effect that resulted in a disastrous tectonic shift that split Domino City into two.
No, there are no kisses in the show.
Yu-Gi-Oh! 5D's seems to take place many years after Yu-Gi-Oh! GX. Yuusei and Yuugi probably aren't related.
Doctor Fudou, he was killed in the Zero Reverse incident.
There isn't a official date for Yuusei's birthday, yet.
They're the same age, because at the end of Yu-Gi-Oh! GX Judai is 18 years old an at the start of Yu-Gi-Oh! 5D's Yuusei is 18 years old.
Yuusei used, until now, five different decks in the anime. You have to specify which one you'd like to know about.
Yuusei (遊星 in kanji) can mean wandering star or planet.
Angela Aki's birth name is Kiyomi Aki.
"Aki" means "autumn" in English.