To me, "Good" is not necessarily defined by fast times. Good to me would be more defined as your dedication, participation, positive attitude and willingness to learn.
I don't think that age plays much of a role either. There are so many various skill levels in any age bracket. There are racers that are 11 and are very fast, there are racers that are 40 and not as fast. It all boils down to how much time and practice you can dedicate to becoming a fast racer.
i know Arco and Flinx are both in there early 30's where as JMR is 18/19 ?? skill comes at all ages ..... Big P and Megabyte are both 15 and last of all Bobkart is in his 50's but all these guys are extremely fast nuff said laters