How does the Advanced age filter's 'on or before' cutoff math work when shifting between age bands?

Answer

Explains the mechanics of Check-Ins Advanced age filters: age range + 'on or before' date computes a birthdate window as of that future anchor date (not today). Shifting the Ages field down by one year/12 months shifts the computed birthdate window back exactly one year, since the anchor date stays fixed. Worked example: 36-47mo vs 24-35mo against Sept 1 2026 cutoff.