Middle Age in the Middle Ages was younger than Middle Age here in the Modern Age.
Life expectancy has greatly increased, so Middle Age comes later.
Although for most, it’s still not in the middle. If you’re going to live to seventy or eighty, fifty is past your actual middle.
Back when I was young, I misheard someone say “Middle Age” and it sounded like “Meddle Age.”
Which, considering how much Middle Aged people meddle with young people, it sounded right.
“Don’t believe a word of it!” said the Middle Aged person. “Just do what I tell you to do.”