On the right/wrong side of 40, 50, etc.
Definition 1 of 2

Age sensitivity
The phrase can sound negative as it highlights someone is older than a notable age, use with caution.

She's on the wrong side of 40, which makes it harder for her in the modeling industry.
Emotional impact
Can evoke emotion; may be perceived as a reminder of aging or lost youth.

Reaching on the wrong side of 50 can feel like a milestone to some.
Colloquial use
Frequently used in casual conversation rather than formal or written contexts.

My brother is on the wrong side of 40 and jokes about getting old.
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