Time being different in EF 2.0 would make a lot of sense and would indeed explain why Hook and Regina haven’t aged. Rumple is ageless because of his dark one curse whereas Regina and Hook are mortal and therefore prone to age. I really dislike the idea of them being frozen in time for 20 years, and I’d prefer it if only Henry aged while no one else did (similar to Gideon in S6b).
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy