How old are they? etc..

Remus Lupin was 38 when he died, and Nymphadora Tonks was 25, so they had a 13 year age difference.

I think it was because there was no proof Harry did it, He could have just shown up and no one would have known for sure.

Draco married Astoria Greengrass, younger sister of one of his classmates Daphne Greengrass. Astoria was played by Tom Feltons real life girlfriend Jade Olivia, Thats why you wouldn't recognize her, Astoria was also never mention till the epiloge.

As for the last question, No idea xD
Hope this helped

Hello fellow HP fan!

Lupin is 38, because he's the same age as Harry's parents who were 20 when they had Harry and Harry turns 18 couple months after the battle Lupin died. Tonks is 7 years older than Harry (she graduated a year before Harry entered Hogwarts according to Wikipedia) so she's 25 when she dies.
13 years... Most people would call that major age difference, I don't. It's... okay.

Because he's Harry Potter and he wouldn't get in trouble for anything even if he was found knifing someone. Anyway I guess they forgot to punish him they were so upset about Malfoy, plus except for Snape of course wouldn't think Harry could have performed such magic.

Her name is Astoria Greengrass, but I know that from imdb. In fact I don't have the slightest memory of any mention of anyone named Greengrass. I just looked up the Epilogue in my copy of DH and it only says Draco Malfoy and his wife. I also looked up my Philosohper's Stone at the Sorting chapter to look for Daphne Greengrass or anyone Greengrass, but no mention at all.

I still don't speak Internet-English, unfortunately so no clue of the last question.

I hope I could help you out.

M.o.M is 'Ministry of Magic.' I don't know if they use that in books one through seven, but the abbreviation is used in 'Fantastic Beasts and Where to Find Them.' The X's stand for ministry classifications of how dangerous they are. The more X's, the more dangerous.

Have you read the books ? The issue with Draco in HBP is explained there fully (HBP). As well as whom he married (DH).

Don't rely on the movies only to get all the details. Many things have been left out.

MoM )= Ministry of Magic. The xxxx classification concerns magical creatures. Check the HP Lexicon the internet, it explains the whole thing.

As well as the characters' age. The Marauders, Lily and Severus were all born between September 1st, 1959, and August 31st, 1960, to be able to enter Hogwarts in September 1971. I let you do the maths.