Yes, 1964, and no, it's not really worth digging through change. They have long since been all culled out. You will occasionally find a silver dime or even more rarely, a quarter, but it's only once in a blue moon.
Silver coins are selling now for around $10 per $1 face value (as "junk silver", with no real numismatic value over bullion). Silver is low right now (which is surprising to me), and is in high demand as an investment/hedge against inflation with the possiblity of total economic collapse looming large over the horizon.