thirty
The word 'treintañero' in Spanish does not mean thirty - that would be 'treinta'. 'Treintañero' is a term used to describe a person who is in their thirties. Similar to how in English we say 'someone is in their thirties', in Spanish you would say 'alguien es treintañero'.
My friend is a very funny thirty-something.
This phrase describes a friend's personality, emphasizing their humor while noting their age category.
Thirty-somethings often seek stability in their lives.
In this sentence, it highlights a common trend among people in their thirties who are looking for stability, whether in career or personal life.
She is enjoying her life as a thirty-something.
This indicates that the woman is embracing her experiences and lifestyle in her thirties, suggesting positivity and contentment.