Mitchell;
I am totally with you. I enjoyed tickling older women when i was kid as well it's fun. I had similar experience as you did.
I had an aunt who would come and visit it us. She would find a way to tickle my feet. (of course I never complained, deep down inside I loved it). One day, when I was about 14, The family went out to a field trip, she came over for a visit, but she didn't want to go, and neither did I. So, she stayed with me while everyone else left.
I went to my room to finish up some homework. When I come back into the living room, ther is my aunt, laying on the couch nyloned feet in the air. I looked up to the sky and said thank you. I walked over and ran my fingers on the soles of her feet. Man, she didn't jump up, she nearly flew!. She looked at me and smiled, and cursed me for being evil.
I sat at the other end of the couch put her feet on my lap and began to tickle without mercy, working her soles, heels and toes. She laughed so hard her cheeks were 3 different shades of red. She then turned the tables on me, we went back and forth. This went on for about an hour and a half before my parents came home. At which time I was sure she would bust me...but she didn't. Every time after that, she let me get in a tickle or two. It was great. Since then I would gamble with older relatives or good friends of the family and see if they had ticklish feet. Honestly, I think some older women like it!!! I think it gives them a chance to be playful and feel like a kid again.