1) No idea.. I'm moving there in 2 weeks but tbh most people I've spoken to are under 25. I don't think u should be age specific, where I live atm I hang out with 18-31 year olds and do many different things so I guess what I'm saying is any1 over like 20 isn't too different to a 30 year old.
2) Message matt who posts in this thread. He has been great to me and obviously aware that i'm a poker player given that contact was made on 2+2 and hes found other players appartments. I think as long as you pay a couple of months rent ahead (the more the better) there are 0 issues. From what I understand the real estate market in malta and the system is alot quicker/sane than more.
3) Residency I'm not sure about best to go to the Malta immigration page. But what I will say is it depends what you want it for. If your just trying to stay longer than 3 months without having to leave/come back in (and your from EU) I believe you can just get an extension pretty easily by visiting embassy etc. might help.
http://www.gov.mt/servicecluster.asp?s=39&l=2