Well, I most likely am your grandmother’s age but my youngest is 19 and in a Catholic college. You need to connect with groups of young people serving the Lord. Catholics are usually those who will be quiet about their faith, usually. Check your diocese for servant events such as the recent March for Life. I was pleasantly surprised at seeing ALL age groups there. High school and college groups with their banners, marching.
Be proactive and start your own ministry, recruit through diocesan newsletter. Is there a need in your area? Can you help in an existing ministry? College campus ministry? Start a Catholic meet and greet for young adults at your parish, advertise, have a barbeque, plan servant projects.