Which of these bands is the oldest?

Pink Floyd is the oldest among the listed bands because it was formed in 1965, making it the earliest established group. The other options, Led Zeppelin (1968), Queen (1970), and Guns N' Roses (1985), were all formed at later dates. With their innovative sound and progressive rock style, Pink Floyd gained immense popularity in the 1970s and continued to leave a profound influence on the music scene for decades to come, solidifying their place as one of the most influential and enduring bands in history.