I'm retired and own three farms totalling just shy of 400 acres.
Income from the farms is a pretty decent chunk of our retirement income. We cash rent the tillable ground, much of the non tillable is in federal CRP type programs that generate some income, and we also selectively log our woodlots every 15 -20 years or so for additional income. Pretty minimal work on my end with steady income coming from most of the ground.
With current cattle prices, you could probably do okay, but I wouldn't want anything to do with it because you have to be there every day. No taking off for vacations unless you have someone to check on the livestock daily. To do it right and cost effectively you also need to raise your own hay, so 100 acres won't handle a lot of cattle, as a large part will be tied up in hay ground, plus you need to move cattle around so they don't wipe out particular pastures. With smaller acreage like this you're likely to be more of a "feed lot" operation, buying and having most of your feed trucked in which will significantly reduce any profits.
Getting started will be costly too; fence, tractor, implements, feeding equipment, barns & sheds, tools, truck, etc.
Very few farmers take regular wages. They bank money when they sell product, then live off what's in the bank and pay the bills till the next sale, hoping there is enough to last. Starting from scratch it will take quite a while to figure out if you are actually coming out ahead on the deal. Raising only 4-5 cattle won't make you any money, but you might get one for the freezer cheap.
It is a pretty rewarding, enjoyable lifelstyle if you like good old fashioned, healthy outdoor work. Farm equipment purchases can also be done without paying sales tax, which is pretty nice.