Cast your mind forward to 2050. What does it look like? Any crowd shot of people walking down Grafton Street would see far more grey hair. In 2020 there were about 158,000 people aged over 80. By 2050 there will be over 470,000 people over 80. Ireland will be an older place unless migration patterns change drastically. Some things can change it, but really, only pretty big things. Candidates for pretty big things that would whack a population pyramid would include a spike or fall off in the birth rate, more pandemics, a war, surges in inward or outward migration,…