Final answer:
Sean is likely experiencing low testosterone levels, commonly associated with andropause in aging males, which can lead to diminished sex drive and other symptoms.
Step-by-step explanation:
Sean may be experiencing low testosterone levels. Aging and the male reproductive system are linked, with declines in Leydig cell activity typically beginning at ages 40 to 50. This can lead to a reduction in circulating testosterone concentrations, which may manifest as a diminished sex drive, a condition often referred to as andropause or male menopause.
Symptoms associated with low testosterone can include feelings of fatigue, reduced muscle mass, depression, anxiety, irritability, and insomnia. While sexual desire and performance may change with age, it's important to note that individual experiences vary greatly.