Low testosterone no matter how old you are is not a good thing. This is a small list of the negatives of low testosterone

PHYSICAL SIGNS AND SYMPTOMS

Assorted Low Testosterone Symptoms
Erectile dysfunction (impotence: inability to develop or maintain an erection)
Fatigue (lack of energy)
Muscle mass and strength (reduced)
Body fat (increased)
Back pain
Osteoporosis development (reduced bone mass/density and increased risk of fracture)
Heart attack risk (higher incidence of sudden death)
Cholesterol (high: especially LDL/HDL ratio)
Refractory period increased (time it takes to have sex again)
Sperm count (reduced fertility)
Gynecomastia (development of male breasts)

MENTAL SIGNS AND SYMPTOMS

Libido decreased (lowered sex drive)
Brain fog (difficulty concentrating)
Memory problems

EMOTIONAL SIGNS AND SYMPTOMS

Depression (sadness, hopelessness, despair)
Motivation and ambition (decreased)
Irritability (increased anger, agitation, or loss of patience)

None of these sound very good