Sanrio bestows a YouTube channel upon Hello Kitty:
Perhaps the most telling thing here is this block of fine print along the bottom of the outro screen: © ’73, ’76, ’13, ’18 SANRIO. Kitty is 45? This probably explains why I thought the voice actress was in her forties.
Addendum: In 1987, there existed something called Hello Kitty’s Furry Tale Theater, with Kitty voiced by Tara Strong, who is, um, presently forty-five. I mention this because I’d typed “voice actress Hello Kitty” into Bing Images, and the first result was a later-than-1987 photo of Tara Strong, who was 12 back then. I have no idea who did the VA for this YT debut.
(Seen first by Fillyjonk.)