Sentence:  It was that sentiment that attracted freshly minted thirty-year-old Pia Dickenson. Seventeen divorces in such a milestone year had left the blonde-haired and rosy-cheeked <WSD>tricenarian</WSD> with ample emotional baggage, along with a discontent toward her use of her youthful years spelled out in scarlet letters. 
Meaning of the word marked with <WSD> tags:  A person in their thirties, a person aged between 30 and 39 years (inclusive).