There are often exceptions to these rules so I'll try to include them when I can.
I'll start off with some general hints and rules and then we'll get to specifics.
By 1967 few brewers still used flat top cans that had to be opened with a church key. Only three brewers that used opening instructions on their cans after 1950; Genesee, Sterling, and Falls City. Aluminum cans came into wide use in the 1970s but the first ones were being sold by Primo and Coors in 1958-1959. A few other brewers including National, Hamms, and Budweiser started using them in the early to mid 1960s. Flat top 15 and 16 oz cans came into use starting in 1953 so a flat top 16 oz can would date between 1953-1964.
There are some exceptions from the 1970s and 1980s, but for MOST cans, if it's a flat top, it dates from before 1967. Krueger Brewing made the only 16 oz cone top in about 1940. The Krueger 16 oz Ale cone top was a tough can until a couple hundred were found in a barn in Vermont.
Other odd sizes started to meet local tax laws on alcohol.
10 and 11 oz cans were produced starting in the 1950s and 14 oz cans began to be produced in the early 1960s.
Look along the seam for the year on most Schlitz cans.
Look and see if there is a tax statement on the can, along the lines of "Internal Revenue Tax Paid" or "Withdrawn Free of Internal Revenue Tax" if so, then the can dates before March 1950.
American Can Company Cans: The American Can Company (Can Co) put a very tiny date code on their cans from 1935-1953. The exceptions are some cans made for states like Oregon that banned the pull tab due to litter in the late 1970s, and some cans were made as flat tops to sell to collectors in the late 1970s and early 1980s.
For 32 oz cans see Quarts and for gallon cans see Gallons.
Cone tops came into use in 1935 and the last one was used by Rice Lake Brewing in 1960.
Unfortunately I do not have the data needed to date a can by its state tax stamp. Sometime when a brewery closed another brewery would purchase its brand names and the new owner continued to use the old brewery name.
Find when the brewery that filled the can was in business. For example, if you search for Christian Heurich, which made Senate Beer among other brands, you will find it closed in early 1956. For example, Baltimore's Gunther Brewery was purchased by Hamms in 1959. Is the can crimped where the body meets the lid and bottom? By 1967 few brewers still used flat top cans that had to be opened with a church key.