I also just joined. In addition to online groups have you also tried to reach out to local disciples in congregations? The church I am currently going to, although great, also is 80% 60+ year olds and I’m 31. The few others my age are not as big into the things I enjoy like hiking in nature, horror and so on. So always feel a bit out of place, but not judged really.
But I’ve been reaching out to other churches and finding a handful of people my age.