There isn't a "youngest age" some women go through it in their twenties if they have medical problems, normal menopause is even as early as thirties but most people get it in their late 40's to early 60's
It's funny me & my husband were talking about that because aim 40 & he is 27 he wants to have a baby & ask me if i felt like i was going threw menopause . My mother went threw it at 35 . Iam 40 & still get a regular period & have no symptoms of it. But i have heard the aeriest age to get it is between 27 & up .(dint know if its true.)