"We should acquire teens as young as possible"

[Highlights]: 2. "Ecosystems - US User Lifetime Value (Phase 1): Based on a conservative set of assumptions, we find the lifetime value (LTV) of users in the United States to be between $200 and $350. People who join FB as 13 year-olds have an LTV of approximately $350, higher than all other teen ages (13-18), due to their very high long term retention. We should acquire teens as young as possible. Phase 2 of the work will explore how the assumptions may change.." "Long term retention is highest at 40%+ for age 13 and then drops to about 15% in the 20s and then rises to roughly 30% in the 50s"