Help at work- how to deal with this old guy who keeps pestering me?

for almost as long as I've had this job in retail (three years, lebih atau less) this old guy keeps trying to give me permen out of a bag. the first few times I just took it to make him leave me alone- I dislike being interrupted while I work like that, unless of course anda actually need help atau you're an old person joking around with me atau whatever, then I'm happy to stop.

but he's done this several times a tahun for three years. I just got tired of it, especially since I don't even like the candy. I've berkata no (he keeps asking "Why? Why?" even though I berkata "Cuz I don't want any" every time), tried walking away, tried avoiding him. He's at least 70 and shorter than I am so I'm not scared atau anything. but the detik to last time I tried going the long way to an aisle I needed to stock in to avoid him and he found me there! and blocked my way out! If he hadn't been old I would have shoved right past him with my shoulder hard.

today I met him again in my new department and he kept standing in my way, though not directly blocking me like last time. I walked around to three different spots trying to work near my gerobak, keranjang and he kept following me. I should have brought my manager up but I was not quite awake yet.

should I tell him off? is it worth it? It sounds silly- "Help, this old man keeps trying to give me candy!" but my aunt and grandma insist it's harassment. I used to think he's senile and must forget that I don't want any but he seems to remember me pretty well and can always find me. I also get the idea he knows I can't be rude with him as a customer and an elderly person, which I hate, especially because it will make me look terrible in front of other customers if I snap at him.