Modern times

According to the Chicago Public Library, the tenth anniversary is traditionally the tin or aluminum anniversary.
In modern times, the appropriate gift is diamonds.
This seems a little pessimistic – are we to assume that modern marriages have no chance of lasting 60 years (traditionally, the 60th is the Diamond Anniversary)?
Well, Dr. T., if we live another 50 years, we’ll get diamonds. Today, we can line up a bunch of tin cans on the fence and throw rocks or something.
Happy anniversary. (K)