The context of the following conversation is Alex didnt bother looking after themselves, they drank too much, ate takeaways everday and drank beer every night.  Unsuprisingly Alex had a heart attack aged 45.:
Alex says I've always been a wild man when it comes to smoke and alcohol. I used to drink beer and eat takeout food everyday..
The friend responds Ha! Me too Grandad. You're the best. So am I..
Alex responds No, it's not funny. Listen to me If you don't want to have a heart attack at age 45 like I did you'd best take care of your health..
The friend responds 45? That's far too young to have a heart attack Granddad..
Alex responds It's the truth. It nearly killed me and I had to spend years sober after that..
The friend responds Okay Grandad. Maybe just one or two beers for me then..