Some people are more sensitive to smell, especially some children. My middle son had an especially keen sense, and sometimes did not have the sensitivity to go along with it!
And reading up, yes there is such a thing as 'old people smell' but perhaps not noticeable to us. I remember my father having an ''invalid' odour, and when my children were small I could tell by their odour when they were ill.
There are many suggestions here for new perfumes, and it is fun to explore something new. I enjoy citrus/light floral top notes and vetiver/musk finish. Over the years I have had O by Lancome, Green Tea and White Tea by Elizabeth Arden. All lovely and light.