I very much suspect not! Especially if you were doing 90-100 mile weeks, you obviously had more ability than I'll ever have.
One of our older guys, in his 60's, was from the Ron Hill, Dave Bedford era.... 100 mile weeks, every week... Had a marathon best of somewhere between 2:15-2:20....
There's a club legend that he ran something like 2:15 one weekend, and 2:21 the next weekend... Not sure if true, but an absolute beast nonetheless!