As a runner for the last 34 yrs (71,000+ miles run) and soon to be 67, I can tell you my race times have slowed over the decades. As a coach to 100's of runners over the decades one thing I have noted. A lot of runners show some improvement over the first 10 yrs of consistent training and racing. Not all, but more than you would think. Ofcourse, not a lot of folks keep running for 10 yrs consistently. Then there are illnesses and injuries. Not sure the same holds true for bike riders--as far as showing improvement over a 10 yr span.
In running someone wisely set up age groups:20-24,25-29, etc., etc. We also have age graded results. In 2008 I ran a 3:57 marathon as a 64 1/2 yr old--Boston Qualifer. Age graded to a 3:06!! Actually the fastest marathon I ever ran was a 3:16 at age 44--10 yrs after starting running. I actually
PR'd all distances from 1 mile to the marathon after 10 yrs of very consistent running/training.
I am much prouder of my 34 yrs of consistent running than I am of any of my race performances. I like the idea that there is no finish line. Be greatful that you can get on a bike and ride or run. I sure am. Oh, I am back into biking after a 12 yr layoff. Ridden over 1,800 miles in just over 10 weeks. I am sure my running was a big asset to being able to ride as well as I have.
Weight: 1986: running
PR's--140-145. (5' 10") Weight 7/2010: 145-150. Stay fit. It works. Nick