I was 4 weeks in bkk and pattaya in june.
I was in grindr and was hit on by quite a few older guys 30-45 range. Many Thais age well and sex - for me - with an older guy can be good. My experience was in bkk many more professional guys who want a quick fun time - no money just fun. Ie - I met a guy from Singapore who was an investment banker. He was 35, nice gym body, very conversational. Etc.. Good sex. A nice chat and goodbye.