Did my colleagues deliberately snub me due to my age?

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Some colleagues arranged a night out together without asking me whether I wanted to go. I only found out from another colleague that they arranged this night out secretly and therefore behind my back. Now these aforementioned colleagues are in their early to mid 20s, and I am in my 40s. Do you think they deliberatley neglected to invite me because of my age, or was it sheer thoughtlessness on theit behalf? When I confronted my 25 year old boss, also on this night out, he simply said he didn't think a 'nightclub' was my scene. I told him that I love nightclubbing now amnd again. And in any case, it would have been lovely to have an invitation to accepe or refuse. The same group of younger colleagues didn't ask another older female colleague who is in her 50s. The thing that exacerbated the issue is that it was a farewell night out to a summer residential job. I ended up spending the last night in my residential post alone watching television whilst my younger colleagues excluded me on their night out clubbing. I felt hurt. But, my parents said that I was being over sensitive about what amounted to as being thoughtless youth.