I get harassed by a strange, old man?

I‘m 29 years old and this man from my neighborhood ( I guess he is about 70 years old) is harassing and following me since I was 24. In the beginning it was just staring but since last year he has become extremely aggressive. He follows me on the street and when I look at him he looks away quickly. Once he walked on a playground and observed me from there, another time he waited outside a store where he saw me buying groceries. When I walked out he stared at me and mumbled things. Sometimes he tries to bump into me, hisses at me or calls me sexist slurs.
The problem is that it always happens in public places, so it would be pointless to call the police as I can’t prove anything. Should I confront him directly or rather not?

I get harassed by a strange, old man?
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