The dates are actually questionable as to when Lufthansa Airlines really celebrated their proper 50th anniversary. 1955 was the year the carrier began flying again after the second world war, so many consider that “date” as the record of official launch. I disagree since their origins date back to services operated in 1926.
And so, this video shows tribute to their 50th year as being 2005. Still very much worth a watch as it showcases their “beginning” and progresses to today: