Outlet extender at my parents house, at least 30 years old but probably older

I remember this was used around the house as needed growing up when we lived in an apartment without enough outlets in each room. My parent had their TV, roku, dvd player and 3 other things plugged in today. Helped them switch everything to something newer. Can anyone tell how old this is? Is it actually a fire hazard that they had 6 things plugged in and always had it on?