I'm not sure... texting your question to her right now... "Grandma, some dude on the internet wants to know if you're over 18, what do I tell him?" (come to think of it, I've never actually looked at her ID carefully, so I can't vouch for her age... but I did grow up in the Nixon era, so you do the math)

Did I not mention in my original post that I saw her playing Solitaire for 4+ hours? (quite frequently)