Dentures, on average, should be replaced every 7-10 years. The
dentures themselves may very well out last that time frame, but for
sanitary reasons and for the reason that your mouth may have
changed in those 7-10 years you should have them replaced within
Depending on how far back you mean by "then", wipers changed
very little for many years and now have changed substantially in
the last 7-10 years mainly by removing the external frame and
moving it inside the wiper blade assembly.
Music has changed over the years. Since 1940, the music started
to get better, and then went down hill over the last 10 years or
so. A lot of music these days talk about lying, cheating, fighting,
and degrading to women.
Society's responsibility to individuals has not changed it has
just been ignored for thirty years or more. Quality education for
all, not PC feel good nonsense, is the answer to most all of our
collective ills today.