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I am 32 and I live in Florida. Florida is full of older people and they outnumber us 20s and 30s year olds. As for Buddhism, the ratio stays pretty consistent to the overall demographic. In my sangha of over one hundred, and I maybe one of three people under 40 years old. Our local university often sends students to experience the sangha for extra credit, but they rarely stay past the assignment.
However I have started a wake up sangha for people in their 20s and 30s (www.wkup.org) here in Fort Myers, and the wake up sanghas do seem to be growing.
Upvote:1
I does seem that Buddhism is more popular among baby boomers in the US, see e.g. http://approachingaro.org/is-buddhism-just-for-baby-boomers
However, as it refers to baby boomers, it looks like it's a US-specific phenomenon, I don't think it applies to Europe or other Western countries.