I will say this. 30 is definitely NOT too young for a MLC. My wife's began at that point. She couldn't deal with losing her youth and aging. At first it was just sadness, but eventually it turned into the "replay" phase where she began reliving her youth and feeling like she was missing out by being married.

MLC's can happen at many different ages.

W 34 Me 42
Married 7 years together 8
0 kids 1 beloved dog
BD 4/6/2018
I moved out 4/7/2018
I moved back in alone 8/05/2018
I file 3/06/2019
D official 5/7/2019