Of the four guys who formed Pink Floyd in 1965 only two are still living.
Syd Barrett, the original lead and rhythm guitarist and vocalist from 1965–1968 died in 2006.
Richard Wright left the band in 1979 but came back from 1990–1995 and 2005. He was a touring/session member from 1979–1981 and 1986–1990. He died in 2008.
Roger Waters is one of the original members and was in the band from 1965–1985 then left for 10 years. He came back in 2005, but not 2012–2014. He's still alive.
David Gilmour is still alive and playing but he didn't join the band until 1967. He stayed with the band 1967-1995, 2005 and 2012-2014.
Nick Mason was the only member to be in the band the whole time, 1965–1995, 2005, and 2012–2014. And he's the only one to play on all of Pink Floyd's studio albums. In 2018 he put together a new band called Nick Mason's Saucerful of Secrets, named after Pink Floyd's second album, to perform the early music of Pink Floyd. Former Blockheads (Ian Dury and the Blockheads) guitarist Lee Harris, and bassist and Pink Floyd collaborator Guy Pratt approached Mason with the idea of forming a band to perform Pink Floyd's early psychedelic material. They were joined by vocalist and guitarist Gary Kemp of Spandau Ballet, and Orb keyboardist Dom Beken. A lot of fans discovered Pink Floyd with The Dark Side of the Moon, their eighth studio album, and Mason wanted to bring their earlier material to a wider audience. In September they released a movie and an album recorded at London's Roundhouse where Pink Floyd played some of their early shows in the 1960s. Most of these songs have never previously appeared on any official live releases by Pink Floyd or any of its members. This is as close as you can get to a time machine to go back and hear early Pink Floyd concerts.
https://www.youtube.com/watch?v=9aKpk_bqJ9A My recommendation is to go to yootoob and listen to the entire 22 song playlist like I did, if you have the time. You can thank me later.
Click the link under the video or click on the video then the YouTube button on the video player.
ETA: Don't forget to set the player to 1080p if it doesn't choose it automatically.
https://www.youtube.com/playlist?list=OLAK5uy_m9US3u8UGXeTgzcxgapvtbNo6Kt0OBKro