I have an 18yr old

chasing me!! What do I do?

tell him you're old enough to be his father? It's the same advice I'd give to a hetero if it was an 18 yo girl

I have tried he wont listen, I'm old enough to be is Grandfather in some social circles

Don't respond to his sms, or any net advances? If he's a real life chaser, just tell him 'sorry kid, not interested, now go play with the other puppies'

or you could just do him a favour by bonking him and thereby help him to get you out of his system*

*I do not advocate this approach

yes you are right, option one is the way to go

too young partners are usually more trouble than they're worth in my experience...

Well it's a problem when their mothers come over wanting to pick up the school uniforms for washing...