Can someone be a "twice awarded Combat Infantry Badge recipient" from different wars (Korea & VN)?

MG Warren D Hodges, Adjutant General for Maryland from 1980-1987, was awarded the CIB for WWII, Korean & Vietnam, so yes

If a person enlisted when they were 17 right at the end of WWII in 1945 and stayed in the service for 40 years (got out when they were 57 years old) which is not unheard of and then served in Korea, and then in Vietnam, and then went to the Grenada Invasion in 1983 and retired 2 years later couldn't they have received 4 of these Combat Infantry Badges? Unlikely I know, but still possible?

Do you not think once is enough

Yes.

Yes a star on top = 2nd and. 2 stars =3rd.

We have a guy in my community who served In WWII, Korea, and Vietnam. He is 97 years old and still drives his car...

I know I’m late to the show but lots of my peers received one each for Grenada, Panama, Gulf War, OIF, OEF. That in itself generated a few that had 3 and a lot that had 2.

The most I ever saw was two; however, I believe that three could have been earned.

Yes. As an Army JROTC cadet in the late 70s I had a retired SFC instructor who had been awarded it 3 times, one each for WW2, Korea, & Vietnam. He was a crusty old so-and-so, but a total professional and the most knowledgeable rifle marksmanship instructor I've ever met. He called it a "perfect attendance award". RIP SFC Grubbs.

Like the Naval Combat Action Ribbon, awarded for periods, not campaigns. Generally, posers can be outed in less than 5 minutes between their ribbons & stories...