hit a stage

[Saki6]

Are parents prepared for holiday hangovers?

Christmas parties are upon us, but how many parents think about how a hangover will affect their parenting?

www.bbc.com

"Some of it is you don't always recognise that you might hit a stage in your life where it affects you differently," Ms Clark says.

Is "hit a stage" an idiom? I'm wondering what it means.

 

[5jj]

you might hit a stage in your life

you might reach/come to/arrive at a point/period in your life

 

[emsr2d2]

You're connecting "hit a stage" incorrectly. It's not an idiom.

hit = reach
a stage = a period