I also believe that spirits do not die, just physical bodies.
When my dad passed 10 yrs ago, we had a beautiful celebration of life ceremony about a week later and after everybody left, those of us who live here were having dinner, talking about him, and the lights flickered. They hadn't done that before, or since. No other signs of spirits in that 70's-era house.
About 12 yrs ago, I was sitting on my couch and felt someone sit at the other end. I looked over & there was a butt dent there. I said, "Hi." but didn't get any kind of reply. I lived in that house for about 7 yrs, it was built in the 20's. Which I guess I need to say 1920's at this point.
About 18 yrs ago at a different house, built in the 80's, we were downstairs and we (2 adults, only people in the house) heard such distinct footsteps upstairs, we both ran up immediately. Nobody up there.
Around the same time in the same house, my son was a baby at the time and on several occasions, he looked up and started laughing, and following something with his eyes. He was definitely seeing something we could not see.
The house we live in now was built in 1900 and I've always expected to have some encounters with some kind of spiritual entity, I've only heard some unattributed knocking, which could have been from something outside, in somebody else's house. And one time I thought I might or might not have heard footsteps, while home alone, but also can't say that wasn't also something I heard from outside.
In 2017, we stayed in an old hotel in WV, buil t in 1901, that is "known" for being "haunted." I had reserved 2 suites for our group & nothing was said upon reservation or check-in about requesting a haunted or non-haunted room. We would have said non-. None of us are interested in purposely seeking spirits or intentionally seeking "haunted" experiences.
When we got there, it was soon before dusk. DH and I were anxious to look around so we dropped our stuff in 1 room and left immediately to wander. When we got back a few hours later, our stuff was in the other room. My niece and mom said they were too creeped out in their 1st choice so they moved our stuff. LOL! Layout was mostly the same, so we didn't mind.
The next morning, DH said he woke up around 2 AM and something was holding him down, he couldn't move anything. He couldn't see anything but felt like it was an old lady.
The next day he & I went for a self-tour to look around the building and happened to start talking to a guy in one of the hallways. We were standing there admiring a picture on the wall and he said it was one of his. He said he was the resident artist and asked if we wanted to see more of his work in his studio. (Amazing, BTW!!)
Then he took us around the hotel to see some spaces where guests aren't allowed to wander and asked what room we were in. We told him & he said that's where the main ghost does most of her haunting. He said there's a picture of what she looked like to him when he ran into her one night, on the wall in our room. We knew which pic he was talking about . We had noticed it & said to each other that it was kind of a creepy pic. DH told him about his encounter in the middle of the previous night & the artist said that sounds like other encounters with the lady.
I never felt anything creepy or spiritual in the building but it all added up to a very interesting stay, with 3 out of 5 people in our group experiencing something.