This is the 1394th most frequent Polish word.
starszy
Older; elder.
In this sentence, 'starszy' means 'older', referring to familial relation by age.
Mój starszy brat mieszka w Warszawie.
My older brother lives in Warsaw.
Here, 'starszy' means 'older', describing the age of objects in comparison.
Ten dom jest starszy od tamtego.
This house is older than that one.
In this context, 'starszy' refers to age, implying the person is of advanced years.