Are Hot Wheels Cars that I have from the mid 60"s tru the mid 70"s Worth anything?? Also how about Matchbox cars and trucks from the same time span??

It depends on the rarity of design, and the quality. But according to listings at this website, I'd say yes:

http://www.thetoypeddler.com/cgi-bin/ttp/ttpdisplay_cat12.cgi?cat1=1&cat2=4&cat1name=Hot%20Wheels%2068-77,%20Redlines

I'd think they would be. I use eBay for helping determine collectible values. Plug a car make and type into their search bar to see what the bids are at for ones you find... and you can put items on your watch list, too, to see what they actually sold for.