Age does not imply value. If you go back to the golden age, most comics have some value if in average condition, but not that much. Extremely fine condition does do well partially because the number of them in that condition is tiny. Even so, most comics in mid range will not pass $3-400 dollars easily. Some indeed defy that as they do in the silver age It just depends on who has the cash and the interest to buy them. Nick Cage was a good example of having them and then needing to sell them. In the 2008 recession, the $8,000 dollar Rolex was dead in the water while the $250,000 thousand one was two years back ordered. People buy those things to flash in front of the plebs.
I knew a gallery owner in Santa Fe who said "Everyone has a unit value. It may be five dollars and it may be $20,000 dollars. It was the amount one could spend in the family without incurring a conversation.." Conversations are deal breakers." He went on to say "I only want people in my gallery that have $20,000 unit values."
So all in all, it's pretty weird to think about when the average person in Africa owns the clothes on their back. Tribal African weapons and shields bring good money. So does Ivory.