The overall median age, IPSS total score, and IPSS quality of life score were 68 years, 21, and 5, respectively. The median peak uroflowmetry, voided volume, and post-voided residual urine were 11.6 (1.2–40.8) cm/sec, 141.3 (8.5–497.4) cc, and 25 (0–498) cc, respectively. The underlying diseases were hypertension (37.1%), diabetes (216%), cardiovascular disease (12.4%), cerebrovascular disease (3.1%), hepatic disease (4.1%), chronic pulmonary disease (4.1%), and benign prostatic hyperplasia (8.2%). The underlying cancers included colorectal (6.2%), lung (11.3%), stomach (12.4%), hepatobiliary (14.1%), gynecologic (14.4%), thyroid (9.3%), hematologic (11.3%), breast (6.2%), neurologic (4.1%), and other (10.7%) cancers. The comparison of baseline characteristics between young (<65 years) and old (≥65 years) groups showed that only quality of life score (5.4 ± 0.8 vs 4.9 ± 1.4) and peak flow rate (17.2 ± 9.1 vs 12.0 ± 7.6) were significantly different (p < 0.05). In the 3-day voiding diary, the old group had significantly fewer nocturia episodes (old, 3.6 ± 2.2 times vs young, 4.5 ± 2.1 times) with smaller voided volume (57.6 ± 88.9 mL vs 207.8 ± 347.8 mL) and smaller total voided volume (1834.8 ± 1024 mL vs 2043 ± 12380 mL) (p < 0.05). However, the urodynamic study parameters did not differ significantly between the groups (p > 0.05).