Hi, I am currently on a school course project working on gaming markets. Would like to seek opinion and possibly research facts and figures on what type (genre and medium) of games older people aged 35 and above play. especially casual gamers. Maybe you can help? Thanks!

Do research.

researchandmarkets.com
marketresearch.com
abiresearch.com
vgchartz.com
http://archives.igda.org/faq.php#biz01
industrygamers.com
gamasutra.com

Moving to business forum.

Take a look at the games on the casual portals. Most people that buy those guys are in the group you are looking for. So probably lots of match three, zuma, and hidden object type games. Stuff that you can play for a few minutes at a time.

Look at big fish games and other casual portals.
Alexa says there is quite a few in the age group 35-44, actually more females than males, than look up the best/most popular games on the site...
http://www.alexa.com/siteinfo/bigfishgames.com

Puzzles.

This probably varies a lot depending on country/culture.

http://www.gamesindustry.com/content/img/page/TG09_3RGB_tn5.jpg
http://www.gamesindustry.com/about-newzoo/todaysgamers_graphs_international