Please take some time to watch this brilliant talk by Siv Midtun Hollup (https://www.linkedin.com/in/siv-midtun-hollup-b263611/) who so beautifully explains why teams absolutely do need juniors and newcomers: https://vimeo.com/923292845
Siv also shares a lot from her own experience on how to make it work best for both the newcomers and the experienced people in the team.
Siv's talk is especially timely given that the market for young and inexperienced workers right now is very challenging in #Norway.