alt Hacker News50 years would be 1976. Perhaps you're confusing it with the myth about women being legally prohibited from opening bank accounts. (1972 was when sex discrimination by businesses was outlawed at the Federal level, though there was never a law that prohibited a women from having a bank account, not directly, and not indirectly since the 1800s. Some banks discriminated against married women, but unless they lived in a one-bank town there were others that were happy to have their business.)
My timeline was loose, but I was specifically talking about the Fair Housing act of 1968: https://www.justice.gov/crt/fair-housing-act-1
So 58/59 years if we want an exact date. But a law passed de jure doesn't mean everyone throws their hands up and willingly complies, so the sand will still be shakey for a good decade.
Of course, YMMV per state, so it's not like the Midwest or west coast had the same level of discrimination as the deep south. But that's the line that this policy became federal.