Hello again,
When I did the Thailand trip it was my first time and I can understand how you are feeling. I have done 2 more since with jy.
Going back to your question, I was the youngest on the trip at the age of 38. The rest of the group were much older then me and they all looked out for me being the youngest. The group I went with were all great people, we all mixed well together and all got along great. I don't mind travelling with older people as I get on well with any age and I don't have a problem with age. On this tour there was people who were widowed and even married and divorced people - whatever their reason they go on jy holidays to meet people and have a holiday, as jy is especially for single travellers.
Hope this helps.