I found this interesting article from a couple of years back. Very unlikely that I can now get down to 5 minutes for the miles. There is a big difference between age graded times and the number of individuals that can actually do certain times. I.e if you are in the top 10% that doesn’t mean 10% of runners are doing that time NOW. It means you are in the top 10% of times run at that distance based on the faster ever times.
mʌɪl 10 days 14 miles