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Is there a side by side comparison table for age group records across the 2 organisations?
No, you'd have to compile it from the VTTA records page, and VTTA maintain separate indoor and outdoor records. What they have in their favour over age-groupers is that a VTTA record stands for all ages below your actual age at which a better performance has not been set, so for example nobody under 59 will be awarded a VTTA indoor hour record unless they exceed K.Gill's 27.144 miles (43.675km)
UCI age groups are moronic. Kent Bostick would make all those slow young people disappear off the record books if it were the VTTA :-)