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Between ages 17 and 21, most adults will develop their third set of molars, more commonly called wisdom teeth.
They’re called wisdom teeth because they’re the last teeth to emerge. You’re presumably “wiser” when these teeth come in.
The first set of molars usually becomes visible at age 6, the second set around 12, and the final set (wisdom teeth) sometime before age 21.
Anthropologists believe humans have evolved beyond needing wisdom teeth, so some people may never get any. Wisdom teeth may go the way of the appendix and become completely unnecessary.

Genetics do cause most adults to develop their wisdom teeth. Study found that at least 53 percent of people had at least one wisdom tooth come in. Men were more likely to have them than women
Just because you don’t see all of your wisdom teeth doesn’t mean they aren’t there. Sometimes wisdom teeth don’t ever erupt and won’t ever become visible. An X-ray can confirm if you have wisdom teeth under your gums.
Humans and our jaws have gotten smaller over time. There are probably a few reasons for this evolutionary progress. Smaller jaws mean there isn’t always enough room in the mouth for all the teeth we’re supposed to have
There are four wisdom teeth in total, two on top and two on the bottom. People can have any number of wisdom teeth from none to all four.
Most jaws are done growing by the time a person is 18 years old, but most wisdom teeth emerge when a person is around 19.5 years old.

Most problems caused by wisdom teeth are due to the fact that they just don’t fit.Problems associated with wisdom teeth include:

crooked teeth
crowded teeth
wisdom teeth growing in sideways
increased tooth decay
jaw pain
cysts under the gums and possibly tumors
Removal of wisdom teeth will be necessary if any of the above changes are apparent.People who get their wisdom teeth removed at a younger age tend to heal better from surgery, before the roots and bone have fully formed.
Some people with impacted wisdom teeth won’t notice any problems at all, while others will have obvious symptoms.
If the tooth becomes infected or causes other issues, you may have symptoms such as:
pain or swelling around the jaw
red, swollen, or bleeding gums
bad breath
an unpleasant taste in your mouth
problems opening your mouth