I'm 52. I've been riding for about 8 years. But my mileage last year was only about 400 miles. I don't ride in cold weather. This year I again started out slowly. However my best achievement was in September when I rode 74 miles in two days. My previous best was 62 miles two days about 5 years ago. Then two weeks later I rode 67 miles in one day. And I wound up doing 282 miles in September. Maybe it's not huge but for me it gave me the thought of a century this coming year.
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"The difference between genius and stupidity is that genius has its limits."
-- Albert Einstein