The study examined gastric emptying in 60 participants, including 30 older adults (65–80 years, median age 71.5 years) and 30 younger adults under 65 years of age with a BMI of 18–30 kg/m². Participants drank 300 ml of water and a 550 kcal rice-based meal, after which the cross-sectional area of the gastric antrum was measured every 15 min for 120–240 min. Fluid emptying time was the same in both groups (median 45 minutes; P=0.737). However, 4-hour solid food voiding rate (4HGER) was significantly lower in older adults (35% ± 9%) versus younger adults (51% ± 12%; P<0.05). Older age and BMI were predictors of delayed emptying of solid food. Older adults had higher postprandial blood glucose levels, but hunger scores did not differ between groups. The conclusion of the study highlights the delayed voiding of solid food in older adults, suggesting the need to reconsider the 8-hour preoperative fast. The study is registered under ChiCTR2100045201.