Do you all agree when Prince said the 60s, 70s and 80s were the golden ages of music?

I'll say it again: nostalgia ain't what it used to be.

Music reflects the zeitgeist of the time made in. 1940's-war years and aftermath,pre and mid war,  music reflected determination and togetherness of war effort, post-celebration and optimism. 1950's-happy times, optimism continues, a more innocent sense of everlasting love, monocultural, homogeneous perception of our world, very insular and feeling of being safe and protected. 1960's- early-basically extension of 50's, mid to late-the world suddenly not so safe, government and cultural institutions not to be trusted, angst, revolution, alongside illusory visions of universal love, communal living, mind altering drugs-finding new doors of perception-ultimate expressions of optimism. Wow, really wide open decade! 1970's-60's dreams gradually die, cynicism, drugs no longer used for mind expansion, rather to numb the mind, freaks or druggies vs. hippie intentions,  society continues in divisive mode-traditional American values vs. new values of 60's, 70's youth. 1980's-Increasing fragmentation, beginning of search for more individualistic ways to live, being more authentic to oneself.

Above, annotated summary of times, much left out, but gist of decades here. Also, I'd suggest popular music more reflective of time produced in than other music forms. Music always reflective of group identity, over time groups subdivide, results in increasing varied genres and sub-genres of music. Today, we can easily create playlists that reflect a singular soundtrack for however we feel at the time. For me, this is the golden age of music, I have all the music made up until now to listen to. I can bring up memories of the past and find so much new and unfamiliar music. I don't particularly care to want to relive my past, the memory of past music to events of my life is good enough.
As to what is a golden age of music for anyone is more applicable to one's age than some objective judgement of what constitutes good music. For me, most of the best music is timeless, I seem to only get into the music rather than feel any specific memory. Memories interfere with pure music enjoyment, mind distracted and fixed on memory rather than music.

Why "Gangsta Rap", the only true Rap, is not in the Golden Age of Music"

Any time "White Folks" write about "Black Folks", take it with a grain of salt; how many white people can vaguely comprehend what it's like to be a slave; how many "White Folks" can vaguely comprehend what it's like to live in a "hard core ghetto".

In the past, a place where predominately Black People lived was called a "Ghetto", but none of those places even remotely compare to "present day ghettos". In the past, many middle class Black People lived where they felt most comfortable, there were also a number of "upper economic Black People" living there as well".

Not until economic factors that affected everyone; such as the high price of all commodities, gasoline being the most notable, did those so called "ghettos" become real "hard core ghettos". Lower middle class neighborhoods all over the USA, became "hard core ghettos" when lower income Blacks could not maintain their property; they were faced with the hard choice of buying food and gasoline, or painting the house; naturally food and gasoline won out. The neighborhood went down, causing middle income "Blacks" and upper income "Blacks" to flee, leaving that entire geographic area to the poorest Blacks.

So you see the last phase in the "Ghetto" was not "White Flight" as everyone is led to believe (that occurred 40 or 50 years ago) it was "Economic Black Flight", that produced current hard core Ghettos, and "Hard Core Ghettos" produced "Gangster Rap", which is an expression of life in an area where the living conditions are socially and physically unacceptable, not because the inhabitants have Black skins, but because they are the worst aspects of the end product of slavery (history is never in the past) and discrimination; "What you see, is what you get" New York, Chicago, St. Louis and L. A., places that generate "Gangster Rap"; the only true Rap, which is an expression of the reality of life in a "Hard Core Ghetto".

Also, like Green Day, prince is, was and always will be vastly overrated. 

It's not just music, it's also films. I asked myself, "Why do I like "Black and White" movies better than current movies"?

Every time I look at a current movie, the characters are doing something that makes no sense what so ever. This can happen a time or two, and I'll go along with it, but too many times and that movie goes off; it just makes no sense, I can not tolerate this any longer.

Evidently they had better writers and better scripts a long time ago. I hate to admit it, but all my friends are not the brightest (but I love them anyway) They seem to be hooked on the most current action movies, and they bring them over for us to enjoy. In no time, this happens, that happens, and I ask my self "Why did he do that? Why did she do that? That was totally illogical. Before I can finish my first popcorn, I'm nodding off, and at the same time trying to fake enjoying the movie.

Maybe I'm just out of step with time? As far as I'm concerned, these are some very strange times.