Hi,
I seriously doubt that a good pilot is made of fast reflexes and motoric skills. Sufficient knowledge and good judgement combined with a non-ego-impaired character are the main ingredients, IMHO :-)
Personally, I wouldn't want to fly solo being older than the average as the risk for temporary impairment because of a sudden health problem is way higher than in younger years. But I'm a fan of (human) redundancy and 2 pairs of Mk 2 Eyeballs up front, but that's just an opinion :-)
Kind regards,
Peter