This happened a long time ago, when I was really little but is one of the few things I actually remember (due to ptsd)
I was at my aunt and uncle's old house and was sitting on the couch with my cousin when I looked out the window. I saw an old lady with curly brown hair and some grayish streaks. She had a soft glow if I remember right. I stared for a minute then turned to my cousin and I said "I have two grandmas" because there was something telling me she was my grandmother on my dad's side of the family.
Though, looking back I have only seen one picture of my grandma and she didn't look anything like that, when she died she had long curly black hair and was young, whereas the woman was old and had short curly brown hair.
I had waited for the woman to come in but she never did, I was rather confused at the time but never brought it up. Not until I was 12 or so and my family gave me warnings and told me not to try to speak to her if I saw her again.
I haven't seen her since but I have felt like I'm being watched 24/7 nowadays. Though I can't help but wonder, can ghosts age, or was that really just someone else and if it was then who? Why did I feel like I knew them? Why haven't I seen them? Where are they now? Was it just my imagination? All questions I may never get an answer to. Though I am not exactly sure what is real and what was a dream anymore.
Have a good day I hope you don't have a traumatizing experience that makes you question reality! Feel free to comment theories and stuff.