The pope believes in climate change.

Catholic religion is failing due to its leadership and failed policies like DEI in church. My religion failed me but God never will.
It depends on which country or subgroup you mean, but here are a few data points:

In the U.S., the median age of Catholic adults is about 49 years old
pewresearch.org
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Among U.S. Catholics, the median age differs by ethnicity: Hispanic Catholic adults have a median age of ~ 42, and non-Hispanic Catholics ~ 53
pewresearch.org

In Australia, the median age for Catholics is ~ 43 years