You asked:

who is older robert plant or janis joplin

  • Janis Joplin
    Janis Joplin
    Janis Joplin is older than Robert Plant. Janis Joplin is 74 years, 10 months and 26 days old (died aged 27 years, 5 months and 4 days) and Robert Plant is 69 years, 3 months and 25 days old.