Has the definitions of young adult and middle age changed in the last 2 years or so?

I’m sure it used to be young adult (18-25) and middle age (40-60) but now it seems young adult has become 18-30 and middle age 35-55.

Yes it has, young adult it now 18-30 and middle age 35-55
No it hasn’t, young adult is still 18-25 and middle age still 40-60
Select gender and age to cast your vote:
Has the definitions of young adult and middle age changed in the last 2 years or so?
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