Afraid of death? That always has been a bad theory. For example, "Young people don't go to church because they are afraid of death and church speaks of the afterlife. Older people are not afraid of death, so they go to church." Either way the "afraid of death" theorists are wrong because people aren't that afraid of death.
Young people are a part of many communities--school, work, social, and possibly church. Retired people lead quieter lives and are less active in community, so they welcome the opportunity to meet as a community. As a rule, young people are leading busier lives, and church may have a lower priority.
Fear of death? Perhaps for you, but not for the great majority of others.