The age at which your appetite decreases is by age 60 and above.
As you age you tend to lose fat free mass and that also includes bones, muscle and organ mass.
As humans age which also tend to be less physically active and these factors can result in lower energy needs and contribute to a decrease in appetite which is normal.
Older people can also experienced impaired senses of smell and taste and that can also make eating food less enjoyable.
Older people can also experience poorer vision and make it harder to stimulate their appetite.
Reduced saliva production as we age is also normal and can make it more difficult to eat and impair and reduce appetite.
Illnesses like dementia and Alzheimer's disease are also a factor in reduced and decreased appetites.
And some older people experience and have food insecurity which is the lack of consistent access to healthy foods and can be a result of financial hardship or physical limitations.
Other things that can lead to a decrease in your appetite include.
Developmental milestones in children as they grow.
Use of nicotine such as electronic cigarettes and smoking tobacco.
And pregnancy, especially during the first trimester of pregnancy.