I've just read, with some disbelief over on the Grandparenting page (title next to Gransnet Forums above this board) that Grandma is lively and trendy whereas Granny is old and wears brown! I'm Granny as I saw lots of my Granny while growing up, my children spent much more time with their Granny, whereas their 8 years younger other Grandmother called Nana (her choice tho she had no time for any of her 7 grandchildren and her own chidren didn't like Nana either - maybe that's why she chose it?) was no fun to be with.
My boys' Granny always wore a skirt but that didn't stop her! She went up the high slide in the swing park to show the youngest one what to do, hooked up her skirt and wooooosh! safely down she went! She baked with them, played water games with them and guarded them with her life. If I'm half the Granny she was (and my own Granny) I'll have happy Grandchildren!