Harassed in the pharmacy

I was at the pharmacy (headphones in!!) waiting to check out when the older man in front of me kept turning around, staring, tried to make small talk. Asked me if i lived around here, i said yes, he goes REALLY. and asked where. I lied, added a block or so (not my best lie) and he responds again, REALLY. He checks out, leaves, as do i. i walk to the corner (again, headphones) he comes up next to me and starts asking what i do,(lies again friends) and introduced himself. follows/walks with me about a block, then said he would give me his card because “everybody wants to contact him” and then proceeds to not get a card but asks for my number. I tell him I’m absolutely not giving a stranger my number and storm off, too afraid to see if he follows and sees where i actually live.