https://www.graphsaboutreligion.com/p/when-are-half-your-members-going
I cannot emphasize this point enough — we are in a lull right now. While most major denominations have been experiencing decline for a while, their ship has remained seaworthy. Yeah, some water will lap over the sides every once in a while, but there are still enough buckets and enough laborers to toss it back into the ocean.[...]
This should come as a shock to no one who is vaguely aware of American religion — Episcopalians are old. In fact, two-thirds of their adult members have celebrated their 60th birthday. In contrast, just 6% are under the age of thirty. Put simply: for every young adult Episcopalian in the pews this Sunday, there will be about ten retirees. Oof.