It might be observed that some cultures hold a preconceived notion that young people are just not interested on the topic of religion. They're too busy doing this, that, or the other thing to be interested in answering the big, tough, philosophical questions of life or developing a life path to address those. Certainly, there is some research to back up the lack of participation in religions by various studies. For example, if you look at these data gathered by PEW Research, folks in the 18-29 demographic report that religion is "very important" in their life only 40% of the time, compared to 51% for the 30-49 demographic and up to 65% for the 65+ crowd. Other commonly-used activities to assess religious engagements are also lowest amongst this demographic.
What do you think is behind these trends? Is religion, deep thinking, and enlightenment really just for old folks? At what age did you become seriously interested in religion? Or maybe there was an age where you became disinterested in it?
I feel that you raise an interesting point, but perhaps there are some aspects that have not been mentioned about this. For almost the entire survey, the older people "participate" (to use a word that envelopes the questions) at a higher level in their church except for one area: Do you feel a sense of awe by the universe?
The key component behind any faith tradition is this sense of something wholly other, the
numinous that Rudolph Otto describes. If a religion is only about doctrine, liturgical norms, and personal enlightenment, then I would argue that what one is describing is a wisdom tradition, not a faith tradition. The foundation of any religion is not an amalgamation of soteriology, morality, supplication, or miracles, but rather it is a response to a common human experience of that
awesome mystery: whether that be manifested by an experience of a person, some thing outside our perception, nature, or even in the movie
Contact, an experience of the universe, where only a poet can truly capture the beauty and awe of that celestial body. This is a component of religion where the Pew Research shows that young people have the same level of involvement as older people.
Second, the survey does not ask any questions about
mission. In this new world of Trump, I have seen many people who have come together to stand in unity and solidarity with others who are marginalized and oppressed. Just as the
numinous is a human experience, so also are suffering, affliction, and poverty. Similarly, the human response to injustice. Whether its about an oil pipeline or tax rates, injustice is something we as humans understand. Unfortunately the responses to those injustices don't always measure up to one's own spirituality. Even still, if a faith tradition or philosophy is to move beyond the abstract, then some form of praxis is needed. A church is not a church if it happens only in a building.
Since the OP sought this survey out as a means to invite older people into a faith community, my humble suggestion would be to move beyond doctrine and philosophy. All ages have access to experience that Mystery, and it is the narratives of that Druidic tradition that allow people to enter into that. Second, the response to social issues is a common meeting ground for many inter-faith gatherings. If you are seeking to invite others and not "convert" (which is how I understand your intention), your community's involvement in social issues invites others to see how your community responds to social injustice and oppression.
TL,DR - There's more to religion than philosophy and thinks. The awe-inspiring experience of the "wholly other" is the same.