s2sxiii, what trail were you riding?

Last year a month or so after I started riding I was out on my mountain bike cruising along at around 15mph. After a bit an older lady entered the trail and was going a bit faster than me. I caught up to her at an intersection and noticed she was between 60-70 years old, very weathered looking, was riding a beat up old road bike with flat bars and had a rack full of stuff. From then on I could not let her go faster than me. I paced her for a few miles at around 18-19 miles until I couldnt keep up anymore. I felt quite humiliated when I had to slow down and admit she was a better rider than me.