Final answer:
Jealousy tends to increase with age, significantly so after age 50, according to research by Rydell.
Step-by-step explanation:
According to the research by Rydell, the correct answer in relation to one's tendency to feel jealous is that it increases with age. This increase is said to be most dramatic by age 50 and continues to rise thereafter. It's important to note that individual experiences with jealousy can vary widely based on personal circumstances, social environments, and other psychological factors. Regardless, this question is highlighting a general trend observed in the research conducted by Rydell.