Great question! According to GlassNode's HODL Waves chart we're at ~15% of the current supply dormant for more than 10 years. My own belief is that approx 20% of the current supply has already been lost (inclusive of the 15% dormant today for more than 10 years), so I'll conjecture that 20-25% of the supply in 10 years will have been dormant for more than a decade.
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