There are always going to be riders who ride faster, longer and harder unless you are Lance, so don't worry aout that. Mid pack in the A group is great, if you are mid pack in the C group you can probably move up. But I think it would be really difficult to start any sport at age 50 and be at an elite level like a Cat 3 racer.
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The problem with the gene pool is that there is no lifeguard and the shallow end is much too large
2013 Noah RS